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2005
Honda CRF250R
OWNER’S MANUAL & COMPETITION HANDBOOK
Introduction
Congratulations on choosing your Honda CRF
motocross motorcycle.
When you own a Honda, you’re part of a
worldwide family of satisfied customers-people
who appreciate Honda’s reputation for building
quality into every product.
Your CRF is a high performance racing
motorcycle that utilizes the latest motocross
technology and is intended for competition use in
sanctioned, closed-course events by experienced
riders only.
Be aware that motocross is a physically
demanding sport that requires more than just a
fine motorcycle. To do well, you must be
excellent physical condition and be a skillful
rider. For the best results, work diligently on
your physical conditioning and practice
frequently.
Before riding, take time to get acquainted with
your CRF and how it works. To protect your
investment, we urge you to take
responsibility for keeping your CRF well
maintained. Scheduled service is a must, of
course. But it’s just as important to observe the
break-in guidelines, and perform all the pre-ride
and other periodic checks detailed in this manual.
You should also read the owner’s manual before
you ride. It’s full of facts,
instructions, safety information, and helpful tips.
To make it easy to use, the manual
contains a table of contents, a detailed list of
topics at the beginning of each section, and an
index at the back of the book.
As you read this manual, you will find
information that is preceded by a
symbol. This information is intended to help you
avoid damage to your Honda, other property, or
the environment.
Unless you are mechanically qualified and have
the proper tools, you should see your Honda
dealer for the service and adjustment procedures
discussed in this manual.
The official Honda Service Manual for your CRF
is available (page 152). It is the same manual
your dealer uses. If you plan to do any service
on your CRF beyond the standard maintenance
procedures in this manual, you will find the
Service Manual a valuable reference.
If you have any questions, or if you ever need a
special service or repairs, remember that your
Honda dealer knows your CRF best and is
dedicated to your complete satisfaction.
Please report any change of address or ownership
to your Honda dealer so we will be able to
contact you concerning important production
information.
You may also want to visit our website at
www.honda.com
Happy riding!
NOTICE
Introduction
A Few Words About Safety
Your safety, and the safety of others, is very important. And operating this motorcycle safely is an important responsibility.
To help you make informed decisions about safety, this manual contains a section devoted to
Motorcycle Safety, as well as a number of Safety Messages
throughout the manual.
Safety Messages are preceded by a safety alert symbol and one of three signal words:
DANGER, WARNING, or CAUTION.
These signal words mean:
You WILL be KILLED or SERIOUSLY HURT if you don’t follow instructions.
You CAN be KILLED or SERIOUSLY HURT if you don’t follow instructions.
You CAN be HURT if you don’t follow instructions.
Of course, it is not practical or possible to warn you about all hazards associated with operating or maintaining a motorcycle. You must use your own good
judgement.
Safety Messages
DANGER
WARNING
CAUTION
Contents
MOTORCYCLE SAFETY...............................1
Important Safety Precautions..........................2
Accessories & Modifications..........................3
Safety Labels.......................................................4
OPERATING CONTROLS .............................5
Component Locations .........................................6
BEFORE RIDING ............................................7
Are You Ready to Ride? .....................................8
Is Your Motorcycle Ready to Ride?....................9
Pre-ride Inspection..........................................9
BASIC OPERATING INSTRUCTIONS ......11
Safe Riding Precautions................................12
Starting & Stopping the Engine ........................13
Break-in Guidelines ..........................................15
SERVICING YOUR HONDA........................17
Before You Service Your Honda
The Importance of Maintenance .......................18
Maintenance Safety...........................................19
Important Safety Precautions........................19
Maintenance Schedule ......................................20
General Competition Maintenance ...................22
Before & After Competition Maintenance........26
Between Motos & Practice Maintenance .....26
After Competition Maintenance ...................26
Service Preparations
Component Locations .......................................28
Seat Removal ....................................................29
Fuel Tank Removal ...........................................30
Subframe Removal............................................32
Service Procedures
Fluids & Filters
Fuel System.......................................................34
Engine Oil .........................................................36
Transmission Oil ...............................................39
Coolant ..............................................................41
Air Cleaner ........................................................43
Crankcase Breather ...........................................45
Engine
Throttle ..............................................................46
Engine Idle Speed .............................................48
Clutch System ...................................................49
Hot Start Lever..................................................53
Spark Plug .........................................................54
Valve Clearance.................................................55
Piston/Piston Rings/Piston Pin..........................63
Chassis
Suspension.........................................................71
Brakes................................................................76
Wheels...............................................................80
Tires & Tubes ....................................................81
Drive Chain .......................................................83
Exhaust Pipe/Muffler ........................................86
Additional Maintenance Procedures .................89
Appearance Care ...............................................91
ADJUSTMENTS FOR COMPETITION .....93
Front Suspension Adjustments..........................94
Rear Suspension Adjustments.........................107
Suspension Adjustments for Track
Conditions ...................................................111
Suspension Adjustment Guidelines.................112
Carburetor Adjustments & Tuning Tips..........115
Chassis Adjustments........................................127
Gearing ............................................................128
Tire Selection for Track Conditions................129
Personal Fit Adjustments ................................130
TIPS................................................................131
Transporting Your Motorcycle ........................132
Storing Your Honda.........................................133
You & the Environment ..................................134
Troubleshooting...............................................135
TECHNICAL INFORMATION ..................137
Vehicle Identification ......................................138
Specifications ..................................................139
Torque Specifications......................................140
High Altitude Carburetor Adjustment .............143
Oxygenated Fuels............................................144
Competition Logbook .....................................145
Optional Parts List ..........................................147
Spare Parts & Equipment................................148
Wiring Diagram...............................................149
CONSUMER INFORMATION...................151
Authorized Manuals ........................................152
Contacting Honda............................................153
Your Honda Dealer..........................................154
The Honda Rider’s Club (USA only) .............155
Table of Contents...........................................156
INDEX ............................................................157
QUICK REFERENCE
Contents
Motorcycle Safety
This section presents some of the most important
information and recommendations to help you
ride your CRF safely. Please take a few
moments to read these pages. This section also
includes information about the location of safety
labels on your CRF.
Important Safety Information...............................2
Important Safety Precautions..........................2
Accessories & Modifications ...............................3
Safety Labels........................................................4
Motorcycle Safety 1
Important Safety Information
Important Safety Precautions
Your CRF can provide many years of pleasure, if
you take responsibility for your own safety and
understand the challenges you can meet in
competitive racing.
As an experienced rider, you know there is much
you can do to protect yourself when you ride.
The following are a few precautions we consider
most importsnt.
Never Carry a Passenger.
Your CRF is designed for one operator only.
Carring a passenger can cause an accident in
which you and others can be hurt.
Wear Protective Gear.
Whether you’re practicing to improve your skills,
or riding in competition, always wear an
approved helmet, eye protection, and proper
protective gear.
Take Time to Get to Know Your CRF.
Because every motorcycle is unique, take time to
become thoroughly familiar with how this one
operates and responds to your commands before
placing your machine, and yourself, in
competition.
Learn and Respect Your Limits.
Never ride beyond your personal abilites or faster
than conditions warrant. Remember that alcohol,
drugs, illness and fatigue can reduce your ability
to perform well and ride safety.
Dont’t Drink and Ride.
Alcohol and riding don’t mix. Even one drink
can reduce your ability to respond to changing
conditions, and your reaction time gets worse
with every additional drink. So don’t drink and
ride, and don’t let your friends drink and ride
either.
Keep your Honda in Safe Condition.
Maintaining your CRF properly is critical to your
safety. A loose bolt, for example, can cause a
breakdown in which you can be seriously
injured.
2 Motorcycle Safety
Accessories & Modifications
Motorcycle Safety 3
Accessories & Modifications
Installing non-Honda accessories, removing
original equipment, or modifying your CRF in
any way that would change its design or
operation, could seriously impair your CRF’s
handling, stability, and braking, making it unsafe
to ride.
WARNING
Improper accessories or modifications
can cause a crash in which you can be
seriously hurt or killed.
Follow all instructions in this owner’s
manual regarding modifications and
accessories.
4 Motorcycle Safety
Safety Labels
Read this label carefully and don’t remove it.
If the label comes off or becomes hard to read, contact your Honda dealer for replacement.
Operating Controls 5
Operating Controls
Read this section carefully before you ride. It
presents the location of the basic controls on your
CRF.
Component Locations ..........................................6
6 Operating Controls
Component Locations
clutch lever
hot start lever
front brake lever
engine stop button
fuel fill cap
throttle grip
choke knob
fuel valve shift lever
kickstarter
rear brake pedal
Before Riding 7
Before each ride, you need to make sure you and
your Honda are both ready to ride. To help get
you prepared, this section discusses how to
evaluate your riding readiness, and what items
you should check on your CRF.
For information about suspension, carburetor,
and other adjustment for competition, see page
93.
Before Riding
Are You Ready to Ride?.......................................8
Is Your Motorcycle Ready to Ride?.....................9
Pre-ride Inspection .............................................9
8 Before Riding
Are You Ready to Ride?
Before riding your CRF for the first time, we
strongly recommend that you read this owner’s
manual, make sure you understand the safety
messages, and know how to operate the controls.
Before each ride, it’s also important to make sure
you and your CRF are both ready to ride.
For information about suspension, carburetor,
and other adjustments, see page 93.
Whether you’re preparing for competition or for
practice, always make sure you are.
• In good physical and mental condition
• Free of alcohol and drugs
• Wearing an approved helmet, eye protection,
and other appropriate riding gear
Although complete protection is not possible,
wearing the proper gear can reduce the chance or
severity of injury when you ride.
WARNING
Not wearing a helmet increases the
chance of serious injury or death in a
crash.
Be sure you always wear a helmet, eye
protection and other protective apparel
when you ride.
Before Riding 9
Is Your Motorcycle Ready to Ride?
Competitive riding can be tough on a motorcycle,
so it’s important to inspect your CRF and correct
any problems you find before each ride. Check
the following items (page numbers are at the
right):
Pre-ride Inspection
Check the following before each ride:
• Engine oil level.............................................37
• Transmission oil level...................................40
• Coolant for proper level................................41
• Cooling system and hoses for condition.......42
• Spark plug for proper heat range, carbon
fouling and high tension cord terminal for
looseness .......................................................54
• Air cleaner for condition and
contamination................................................43
• Clutch lever adjustment and freeplay...........49
• Hot start lever freeplay .................................53
• Steering head bearing and related parts
for condition..................................................89
• Carburetor throttle operation ........................47
• Tires for damage or improper inflation
pressure ........................................................81
• Spokes for looseness.....................................80
• Rim locks for looseness................................80
• Front and rear suspension for proper
operation ..................................................71,72
• Front and rear brakes, check operation ........76
• Drive chain for correct slack and adequate
lubrication .....................................................83
• Drive chain guide, sliders and drive chain
rollers for damage or wear............................83
• Exhaust pipe/Muffler inspection,
removal and installation................................86
• Every possible part for looseness (such as
cylinder head nuts, engine mounting bolts,
axle nuts, handlebar holder bolts, fork triple
clamp bolts, drive chain adjuster, drive chain
guide, wire harness connectors, kickstarter
mounting bolt) ............................................140
WARNING
Improperly maintaining this motorcycle or
failing to correct a problem before riding
can cause a crash in which you can be
seriously hurt or killed.
Always perform a pre-ride inspection
before every ride and correct any
problems.
10 Before Riding
Basic Operating Instructions 11Basic Operating Instructions 11
Basic Operating Instructions
This section gives basic information on how to
start and stop your engine as well as break-in
guidelines.
Safe Riding Precautions .....................................12
Starting & Stopping the Engine .........................13
Preparation ....................................................13
Starting Procedure ........................................13
Flooded Engine.............................................13
How to Stop the Engine................................14
Break-in Guidelines ...........................................15
12 Basic Operating Instructions12 Basic Operating Instructions
Basic Operating Instructions
Safe Riding Precautions
Before riding your CRF for the first time, please
review the
Important Safety Precaution
beginning on page 2 and the previous section,
titled
Before Riding.
For your safety, avoid starting or operating the
engine in an enclosed area such as a garage.
Your CRF’s exhaust contains poisonous carbon
monoxide gas which can collect rapidly in an
enclosed area and cause illness or death.
Basic Operating Instructions 13Basic Operating Instructions 13
Starting & Stopping the Engine
Always follow the proper starting procedure
described below.
Your CRF can be kickstarted with the
transmission in gear by pulling in the clutch lever
before operating the kickstarter.
Preparation
Make sure that the transmission is in neutral.
Turn the fuel valve ON.
Starting Procedure
Always follow the proper starting procedure
described as follow.
Check the engine oil, transmission oil and coolant
levels before starting the engine (pages 37,40,41).
Cold Engine Starting
1. Turn the fuel valve (1) ON.
2. Shift the transmission into neutral.
3. If the temperature is 35°C (95°F) or below,
pull the choke knob (2) fully out.
4. If the temperature is below 0°C (32°F), open
the throttle two or three times. (The engine
requires a richer mixture for starting in cold
weather. When the throttle is so opened, the
accelerator pump will feed extra fuel to the
cylinder, thereby facilitating starting in cold
weather.)
5. With the throttle closed, operate the
kickstarter starting from the top of the
kickstarter stroke, kick through to the bottom
with a rapid, continuous motion.
(Do not open the throttle, As the carburetor is
equipped with an accelerator pump, excessive
fuel will be charged into the engine, and the
spark plug will be fouled if the throttle is
opened and closed repeatedly. Excessive fuel
in the engine makes kickstarting difficult.)
6. About a minute after the engine starts, push
the choke knob back all the way to fully OFF.
If idling is unstable, open the throttle slightly.
W
arm Engine Starting
1. Turn the fuel valve ON.
2. Shift the transmission into neutral.
3. Pull the hot start lever (3) and kick-start the
engine. (Do not open the throttle.)
4. As soon as the engine starts, release the hot
start lever.
(1) fuel valve (2) choke knob
(1)
(2)
(3)
(3) hot start lever
Starting the engine after a stall during riding or
after a fall
1. Shift the transmission into neutral.
2. Pull the hot start lever and kick-start the
engine. (Do not open the throttle).
3. As soon as the engine starts, release the hot
start lever.
Flooded Engine
If the engine fails to start after repeated attempts,
it may be flooded with excess fuel. To clear a
flooded engine:
1. Shift the transmission into neutral.
2. With the throttle fully opened, repeat
kickstarter operation approximately 10 times
very slowly to discharge excessive fuel from
the engine.
3. Pull the hot start lever and kick-start the
engine (Do not open the throttle.)
4. As soon as the engine starts, release the hot
start lever.
14 Basic Operating Instructions
Starting & Stopping the Engine
14 Basic Operating Instructions
How to Stop the Engine
(1)
(2)
(1) throttle grip (2) engine stop button
Normal Engine Stop
1. Shift the transmission into neutral.
2. Turn the fuel valve OFF.
3. Lightly open the throttle (1) 2 – 3 times, and
then close it.
4. Depress and hold the engine stop button (2)
until the engine stops completely.
Failure to close the fuel valve may cause the
carburetor to overflow, result in hard starting.
Emer
gency Engine Stop
To stop the engine in an emergency, press the
engine stop button.
Basic Operating Instructions 15
Break-in Guidelines
Help assure your CRF’s future reliability and
performance by paying extra attention to how
you ride during the first operating day or 15
miles (25 km).
During this period, avoid full-throttle starts and
rapid acceleration.
This same procedure should be followed each
time when:
• piston is replaced
• piston rings are replaced
• cylinder is replaced
• crankshaft or crank bearings are replaced
16 Basic Operating Instructions
Servicing Your Honda 17
Servicing Your Honda
Keeping your CRF well maintained is absolutely
essential to your safety. It’s also a good way to
protect your investment, get maximum
performance, avoid breakdowns, and have more
fun.
To help keep your CRF in good shape, this
section includes a Maintenance Schedule for
required servicing and step-by-step instructions
for specific maintenance tasks. You’ll also find
important safety precautions, information on oils,
and tips for keeping your Honda looking good.
An ICM (Ignition Control Module) system is
used on this motorcycle; consequently, routine
ignition timing adjustment is unnecessary. If you
want to check the ignition timing, refer to the
Honda Service Manual (page 152).
Before You Service Your Honda
The Importance of Maintenance ........................18
Maintenance Safety............................................19
Important Safety Precautions........................19
Maintenance Schedule .......................................20
General Competition Maintenance ....................22
Before & After Competition Maintenance.........26
Between Motos & Practice Maintenance .....26
After Competition Maintenance ...................26
Service Preparations
Component Locations ........................................28
Seat Removal .....................................................29
Fuel Tank Removal ............................................30
Subframe Removal.............................................32
Service Procedures
Fluids & Filters
Fuel System........................................................34
Engine Oil ..........................................................36
Transmission Oil ................................................39
Coolant ...............................................................41
Air Cleaner .........................................................43
Crankcase Breather ............................................45
Engine
Throttle ...............................................................46
Engine Idle Speed ..............................................48
Clutch System ....................................................49
Hot Start Lever...................................................53
Spark Plug ..........................................................54
Valve Clearance..................................................55
Piston/Piston Rings/Piston Pin...........................63
Chassis
Suspension..........................................................71
Front Suspension Inspection........................71
Rear Suspension Inspection.........................72
Fork Oil Change ..........................................73
Brakes.................................................................76
Wheels................................................................80
Tires & Tubes .....................................................81
Drive Chain ........................................................83
Exhaust Pipe/Muffler .........................................86
Additional Maintenance Procedures ..................89
Appearance Care ................................................91
18 Servicing Your Honda
WARNING
Improperly maintaining this motorcycle or
failing to correct a problem before you
ride can cause a crash in which you can
be seriously hurt or killed.
Always follow the inspection and
maintenance recommendations and
schedules in this owner’s manual.
The Importance of Maintenance
Keeping your CRF well-maintained is absolutely
essential to your safety. It’s also a good way to
get maximum performance during each moto.
Careful pre-ride inspections and good
maintenance are especially important because
your CRF is designed to be ridden in off-road
competition.
Remember, proper maintenance is your
responsibility. Be sure to inspect your CRF
before each ride and follow the Maintenance
Schedule in this section.
Servicing Your Honda 19
Maintenance Safety
This section includes instructions on how to
perform some important maintenance tasks.
Some of the most important safety precautions
follow. However, we cannot warn you of every
conceivable hazard that can arise in performing
maintenance. Only you can decide whether or
not you should perform a given task.
Important Safety Precautions
• Make sure the engine is off before you begin
any maintenance or repairs.
This will help eliminate several potential
hazards:
Carbon monoxide poisoning from engine
exhaust.
Be sure there is adequate ventilation
whenever you operate the engine.
Burns from hot motorcycle parts. Let the
engine and exhaust system cool before
touching.
Injury from moving parts. Do not run the
engine unless instructed to do so.
• Read the instructions before you begin, and
make sure you have the tools and skills
required.
• To help prevent the motorcycle from falling
over, park it on a firm, level surface, using the
optional work stand or a maintenance stand to
provide support.
• To reduce the possibility of a fire or
explosion, be careful when working around
gasoline. Use only a non-flammable (high
flash point) solvent such as kerosene —not
gasoline— to clean parts. Keep cigarettes,
sparks, and flames away from all fuel-related
parts.
WARNING
Failure to properly follow maintenance
instructions and precautions can cause
you to be seriously hurt or killed.
Always follow the procedures and
precautions in this owner’s manual.
20 Servicing Your Honda
Maintenance Schedule
To maintain the safety and reliability of your
CRF, regular inspection and service is required as
shown in the Maintenance Schedule that follows.
The Maintenance Schedule lists items that can be
performed with basic mechanical skills and hand
tools. Procedures for these items are provided in
this manual.
The Maintenance Schedule also includes items
that involve more extensive procedures and may
require special training, tools, and equipment.
Therefore, we recommend that you have your
Honda dealer perform these tasks unless you
have advanced mechanical skills and the required
tools. Procedures for items in this schedule are
provided in a service manual available for
purchase from your dealer (page 154).
Service intervals in the maintenance schedule are
expressed in terms of races and riding hours. To
avoid overlooking required service, we urge you
to develop a convenient way to record the
number of races and/or hours you ride.
If you do not feel capable of performing a given
task or need assistance, remember that your
Honda dealer knows your CRF best and is fully
equipped to maintain and repair it. If you decide
to do your own maintenance, use only genuine
Honda parts or their equivalents for repair or
replacement to ensure the best quality and
reliability.
Perform the pre-ride inspection (page 9) at each
scheduled maintenance period.
Summary of Maintenance Schedule Notes and
Procedures:
Notes:
1. Clean after every heat for dusty riding
conditions.
2. Replace every 2 years. Replacement requires
mechanical skill.
3. Replace after the first break-in ride.
4. Inspect after the first break-in ride.
5. Replace the transmission oil, if the clutch
discs and plates are replaced.
Maintenance Procedures:
I: inspect and clean, adjust, lubricate, or replace,
if necessary
C: clean
L: lubricate
R: replace
Servicing Your Honda 21
Maintenance Schedule
ITEMS
THROTTLE OPERATION
HOT START SYSTEM
AIR FILTER
CRANKCASE BREATHER
SPARK PLUG
RADIATOR COOLANT
VALVE CLEARANCE / DECOMPRESSOR SYSTEM
ENGINE OIL
ENGINE OIL FILTER
ENGINE IDLE SPEED
PISTON AND PISTON RINGS
PISTON PIN
TRANSMISSION OIL
COOLING SYSTEM
DRIVE CHAIN
DRIVE CHAIN SLIDER
DRIVE CHAIN ROLLER
DRIVE SPROCKET
DRIVEN SPROCKET
BRAKE FLUID
BRAKE PADS WEAR
BRAKE SYSTEM
CLUTCH SYSTEM
CONTROL CABLES
EXHAUST PIPE/MUFFLER
SUSPENSION
SWINGARM/SHOCK LINKAGE
FORK OIL
NUTS, BOLTS, FASTENERS
WHEELS/TIRES
STEERING HEAD BEARINGS
(NOTE 1)
(NOTE 2)
(NOTE 4)
(NOTE 3)
(NOTE 3)
(NOTE 5)
(NOTE 2)
(NOTE 5)
(NOTE 3)
I
I
C
I
I
I
I
I
I
I
I,L
I
I
I
I
I
I
I
I
I,L
I
I
I
I
R
L
R
I
R
R
R
R
R
46
53
43
45
54
41
55
36
38
48
63
63
39
42
83
83
84
85
85
77
79
76
49
89
86
71
25, 72
73
98
90
80,81
89
R
I
FORK TUBE/SLIDER
DAMPER
FREQUENCY
NOTE Ref. Page
Each race
or about
2.5 hours
Every 3 races
or about
7.5 hours
Every 6 races
or about
15.0 hours
Every 9 races
or about
22.5 hours
Every 12 races
or about
30.0 hours
This maintenance schedule is based upon average riding condition. Machine subjected to severe use require more frequent servicing.
NOTE: 1.Clean after every heat for dusty riding conditions.
2.Replace every 2 years. Replacement requires mechanical skill.
3.Replace after the first break-in ride.
4.Inspect after the first break-in ride.
5.Replace the transmission oil, if the clutch discs and plates are replaced.
Perform the Pre-ride Inspection at each scheduled maintenance period.
I: Inspect and Clean, Adjust, Lubricate or Replace if necessary. C: Clean. L: Lubricate. R: Replace.
22 Servicing Your Honda
General Competition Maintenance
Perform maintenance on firm, level ground using
the optional workstand, or equivalent
support.
When tightening bolts, nuts or screws, start with
the larger diameter or inner fasteners, and tighten
them to the specified torque using a crisscross
pattern.
Use genuine Honda parts or their equivalent
when servicing your CRF.
Clean parts in non-flammable (high flash point)
cleaning solvent (such as kerosene) when
disassembling. Lubricate any sliding surface,
O-rings, and seals before reassembling. Grease
parts by coating or filling where specified.
After any engine disassembly, always install new
gaskets, O-rings, cotter pins, piston pin clips,
snap rings, etc. when reassembling. After
reassembly, check all parts for proper installation
and operation.
All Pre-ride Inspection Items
Refer to Pre-ride Inspection page 9.
Servicing Your Honda 23
General Competition Maintenance
24 Servicing Your Honda
General Competition Maintenance
Handgrips
Always use Honda Hand Grip Cement (U.S.A only) or
Honda Bond A when replacing handgrips.
Throttle Grip
Align the index mark on the throttle grip with the edge of the
throttle cable guide. Left handlebar grip: Align the “∆” mark
on the left handlebar grip with the punch mark on the
handlebar.
Refer to the Service Manual for installation
instructions.
For added security, you may choose to safety wire the hand
grips to the handlebar and throttle to prevent the possibility
of them loosening. Position the twisted wire ends away from
your palms and be sure to bend the wire ends well into the
grip rubber so they will not snag your glove.
Throttle Control
Remove the throttle control every few rides, clean the inside
of the drum and the handlebar thoroughly, and apply a light
coating of silicone lubricant. Inspect the cable carefully for
kinks or other damage that may restrict throttle control in
any way. Move the handlebar from lock to lock to be sure
there is no cable interference. Check to be sure the top of the
carburetor is screwed on tight. Make certain the throttle
operation is perfect after servicing and inspecting.
Gaskets
Always use new gaskets when reassembling components.
Cylinder Removal
Put a little grease on the cylinder mounting dowels to
prevent corrosion from dissimilar metals. The tolerances are
quite tight, so it’s important to keep these dowels absolutely
clean (page 65).
Fuel Filter
Periodically drain the fuel from the tank, remove and clean
the fuel valve/filter. Replace the fuel valve O-ring if there
are any signs of damage or deterioration (page 35).
Fuel Contamination
Refer to Fuel System in your Owner’s Manual, page 34, and,
in this supplement, Fuel System, page 34.
Check the fuel lines for deterioration, damage, or leakage.
Replace the fuel lines, if necessary.
Periodically drain the fuel from the tank, remove and clean
the fuel valve and fuel strainer screen. Replace the fuel
valve O-ring if there are any signs of damage or deterioration
(page 35).
Loosen the exterior drain screw and examine the fuel that
flows out of the float bowl. If you notice anything in the
fuel, such as water or dirt, remove the float bowl and inspect
its contents (page 117).
For maximum efficiency, drain and replace fuel that has
remained in your fuel tank for more than a month.
Engine Mounting Bolts
Make sure the engine mounting bolts are tightened to the
proper torque specification. For added peace of mind,
remove the nuts, clean the threads, and apply Honda Thread
Lock or an equivalent prior to torquing the nuts.
Electrical Connectors
Clean electrical connectors and wrap them with electrical
tape to reduce the possibility of unwanted disconnections,
water shorts or corrosion. Additional corrosion protection is
offered by using Honda Dielectoric Grease on all electrical
connections.
Suspension Linkage Lubrication
Disassemble, clean, inspect and lubricate all pivot bearings
after each 7.5 hours of running time in order to maintain
proper suspension performance and minimize component
wear. Use Honda Moly 60 paste (U.S.A. only) or
molybdenum disulfide paste (containing more than 40%
molybdenum disulfide additive).
Swingarm Pivot Lubrication
Clean, inspect and lubricate when servicing suspension
linkage pivots. Be sure all of the suspension pivot seals are
in good condition. Use Honda Moly 60 paste (U.S.A. only)
or molybdenum disulfide paste (containing more than 40%
molybdenum disulfide additive).
Swingarm
Do not attempt to weld or otherwise repair a damaged
swingarm. Welding will weaken the swingarm.
Footpegs
Worn footpeg teeth can be repaired by filing the grooves
between the teeth with a triangular shaped file.
Be aware that filing them too sharp will reduce boot sole
lifespan. Sharpen only the points of the teeth. Filing the
grooves deeper will weaken the footpegs. Be sure the pegs
are free to pivot freely and that the pivot pin retaining cotter
pins are in good condition.
Brake Fluid Replacement
Refer to Brake Pad Wear in your Owner’s Manual, page 79.
Brake Caliper Inspection: Be sure both the front and rear
calipers are able to move freely on the caliper bracket pins.
Check pad thickness periodically and replace when
minimum thickness is reached. If the brakes fade when they
are hot, inspect the pads for glazing or damage, and replace
if necessary.
Brake Fluid Replacement: Replace the hydraulic fluid in the
brake system every two years. Replace the fluid more
frequently if you subject your brakes to severe use. Heavy
braking heats the brake fluid and it may deteriorate sooner
than expected. Any type of riding, that requires frequent use
of the brakes, such as in tight woods, can shorten the service
life of brake fluid.
Steering Head Bearings
Periodically clean, inspect and regrease the steering head
bearings — especially if wet, muddy or extremely dusty
courses are encountered often.
Water Pump Inspection Hole
After every race, check the inspection hole, located just
below the water pump cover on the right crankcase cover.
Clean away any clogged dirt or sand, if necessary. Look for
coolant or oil leakage. Leaking coolant indicates a worn or
damaged water seal. Leaking oil indicates a bad
transmission oil seal. If replacement is necessary, both seals
should be replaced.
Fork Oil/Performance
Disassemble, clean and inspect the fork and replace the oil
regularly. Contamination due to the tiny metal particles
produced from the normal action of the fork, as well as
normal oil breakdown, will deteriorate the performance of
the suspension. Refer to the Honda Service Manual. Use
only Pro Honda HP Fork Oil 5W (U.S.A. only) or
equivalent which contains special additives to assure
maximum performance of your CRF’s front suspension.
Frame
Because your CRF is a high-performance machine, the frame
should not be overlooked as part of your overall competition
maintenance program. Periodically inspect the frame
closely for possible cracking or other damage. It makes
good racing sense.
Spokes
Check spoke tension frequently between the first few rides.
As the spokes, spoke nuts and rim contact points seat-in, the
spokes may need to be retightened. Once past this initial
seating-in period, the spokes should hold their tension. Still,
be sure your race maintenance program includes checking
spoke tension and overall wheel condition on a regular basis
(page 80).
Nuts, Bolts, Etc
Application of a thread locking agent to essential fasteners
offers added assurance and security. Remove the nuts, clean
the threads of both the nuts and bolts, apply Honda Thread
Lock or an equivalent and tighten to the specified torque.
Servicing Your Honda 25
General Competition Maintenance
26 Servicing Your Honda
Before & After Competition Maintenance
Between Motos & Practice Maintenance
After practice or between motos you have a
chance to make additional checks and
adjustments.
• Clean accumulated dirt from under the
fenders and off the wheels, suspension
components, hand grips, controls, and
footpegs. A stiff, nylon parts cleaning brush
works well.
• Check tire air pressure.
•
Check spoke tension and rim lock nut security.
• Check sprocket bolt and nut security.
• Clean the sides of the drive chain with a stiff,
nylon parts-cleaning brush. Lubricate and
adjust the chain as necessary.
Do not perform maintenance while engine is
running.
Injury to your fingers or hands may result.
• After adjustment, check that the chain adjuster
index marks (1) are in the same position on
each side. This will ensure that the rear wheel
is in proper alignment and allow
maximum performance from the rear disc
brake. Maintaining proper wheel alignment
will also extend brake pad wear.
• Suspend the front wheel above te ground and
use the pressure release screws (1) to release
the built-up pressure (in excess of normal
atmospheric pressure: 0 psi) in the fork tubes.
This pressure is caused by normal fork action
while riding. (If you are riding at altitude,
remember that fork pressure of 0 at sea level
will increase as elevation increases.)
(1) chain adjuster index marks
(1) pressure release screws
(1)
(1)
After Competition Maintenance
It is important to the long term performance of
your CRF to practice a consistent maintenance
program. Right after the event is a good time to
begin your next maintenance cycle.
After Race Lubrication
Apply a light coating of rust-inhibiting oil to the
drive sprocket and any steel portions of the
chassis or engine where the paint has worn away.
This will prevent rusting of the exposed metal.
Apply rust-inhibiting oil more heavily if the
event was particularly wet or muddy. Take care
to avoid spraying any oil near the disc brakes or
the disc rotors.
Remove the drive chain, clean it, and lubricate
the chain and sprockets. Be sure the chain is
wiped clean and is dry before applying the chain
lube.
Take care to prevent catching your fingers
between the chain and sprocket.
Servicing Your Honda 27
Before & After Competition Maintenance
Routine Cleaning
If your CRF is only slightly dirty, it is best to
clean it by hand with the aid of a stiff bristled
nylon brush and some clean rags.
Take care to prevent catching your fingers
between the chain and sprocket.
A variety of reasonably priced cleaning brushes
are available from variety, drug, food, and
hardware stores. Some of these brushes are
extremely useful in removing dirt from the many
tight contours of the metal pieces of your CRF.
Avoid using stiff, abrasive brushes on the plastic
or rubber parts.
If your CRF was exposed to sea air or salt water,
rinse it as soon as possible after the event, dry it,
and apply a spray lubricant to all metal parts.
If you decide to wash your motorcycle or use
cleaners, refer to
Appearance Care (page 91).
28 Servicing Your Honda
Component Locations
choke knob
air cleaner housing cover
rear suspension
air cleaner
chain slipper
rear wheel
axle
chain
adjuster
drive chain
chain slider
transmission oil
drain boltengine oil drain bolt
left side
cover
clutch lever
fuel tank
carburetor
front brake hose
steering
head
front suspension
fuel valve
shift lever
kickstarter
throttle
front brake lever
spark plug
front wheel axle
rear brake pedal
clutch lever
hot start lever
front brake lever
engine stop button
fuel fill cap
radiator cap
throttle grip
Servicing Your Honda 29
Seat Removal
Refer to Safety Precautions on page 19.
Removal
1. Remove the seat bolts (1) and collars (2).
2. Slide the seat (3) back.
(1) seat bolts (3) seat
(2) collars
Installation
1. Slide the seat front prong (4) onto the seat
bracket (5) and the seat rear prong (6) onto
the tab (7) by pushing down and forward on
the seat in each of these areas.
2. Install the collars and tighten the seat bolts.
19 lbf·ft (26 N·m, 2.7 kgf·m)
(4) seat front prong
(5) seat bracket
(6) seat rear prong
(7) tab
(3)
(2)
(1)
(4)
(5)
(7)
(6)
30 Servicing Your Honda
Fuel Tank Removal
Refer to Safety Precautions on page 19.
Removal
1. Turn the fuel valve (1) OFF.
5. Pull the breather tube (5) out of steering stem
nut.
6. Unhook and remove the fuel tank band (6).
7. Remove the fuel tank bolt (7).
(5) breather tube
(6) fuel tank band
(7) fuel tank bolt
8. Disconnect the fuel line (8) from the fuel
valve. The fuel line leading to the
carburetor must be disconnected, not the fuel
line leading to the fuel tank.
9. Remove the fuel valve bolt (9) and fuel valve.
10.Remove the fuel tank.
(8) fuel line (9) fuel valve bolt
WARNING
Gasoline is highly flammable and
explosive. You can be burned or
seriously injured when handling fuel.
• Stop the engine and keep heat, sparks
and flame away.
• Handle fuel only outdoors.
• Wipe up spills immediately.
(4) (2)
(3)
(7)
(5)
(6)
(9)
(8)
(2) shroud A bolts
(3) shroud B bolts/collars
(4) shrouds
(1)
(1) fuel valve
2. Remove the seat (page 29).
3. Remove the shroud A bolts (2).
4. Remove the shroud B bolts/collars (3) and
shrouds (4).
Servicing Your Honda 31
Fuel Tank Removal
(2)
(1)
(3)
(4)
(6)
(5)
(7)
(8)
(10)
(9)
Installation
1. Install the fuel tank on the frame.
2. Install the fuel valve (1) and fuel valve bolt
(2).
3. Connect the fuel line (3) to the fuel valve.
(1) fuel valve (2) fuel valve bolt
(3) fuel line
4. Install the fuel tank bolt (4).
5. Hook the air cleaner cover rubber (5).
6. Install the fuel tank band (6).
7. Put the breather tube (7) in the steering stem
nut.
(7) breather tube
8. Install the shrouds (8) and shroud B bolts/
collars (9).
9. Install the shroud A bolts (10).
(8) shrouds
(9) shroud B bolts
(10) shrouds A bolts
(4) fuel tank bolt
(5) air cleaner cover rubber
(6) fuel tank band
10. Install the seat (page 29).
32 Servicing Your Honda
(13)
(14)
(12)
Subframe Removal
Refer to Safety Precautions on page 19.
Removal
1. Remove the seat (page 29).
2. Remove the side covers (1) by removing the
bolts/collors (2).
(1) side covers
(2) bolts/collars
3. Loosen the muffler clamp bolt (3).
4. Remove the muffler A bolt (4), muffler B
bolt/washer (5) and muffler (6).
(3) muffler clamp bolt
(4) muffler A bolt
(5) muffler B bolt/washer
(6) muffler
5. Disconnect the crankcase breather tube (7).
6. Unhook the fuel tank band (8), and remove it.
7. Unhook the air cleaner cover rubber (9).
8. Loosen the screw (10) on the air cleaner
connecting tube clamp (11).
(7) crankcase breather tube
(8) fuel tank band
(9) air cleaner cover rubber
(10) screw
(11) air cleaner connecting tube clamp
9. Remove the subframe mounting A bolts (12)
and subframe mounting B bolt (13). Then
remove the subframe (14) by pulling it
straight backward.
(12) subframe mounting A bolts
(13) subframe mounting B bolt
(14) subframe
Installation
1. Loosely attach the upper and lower ends of
the subframe (1) to the mainframe while
connecting the air cleaner connecting tube to
the carburetor. Then align the subframe with
the rear wheel and tighten the subframe
mounting B bolt (2) and subframe mounting A
bolts (3) to the specified torque:
B bolt:
22 lbf·ft (30 N·m, 3.1 kgf·m)
A bolt: 36 lbf·ft (49 N·m, 5.0 kgf·m)
(1) subframe
(2) subframe mounting B bolt
(3) subframe mounting A bolts
(1) (2)
(5)
(6) (4) (3)
(8)
(9)
(7)
(11)
(10)
(2)
(1)
(3)
Servicing Your Honda 33
Subframe Removal
2. Tighten the screw (4) on the air cleaner
connecting tube clamp (5).
3. Hook the air cleaner cover rubber (6).
4. Install and hook the fuel tank band (7).
5. Connect the crankcase breather tube (8).
(4) screw
(5) air cleaner connecting tube clamp
(6) air cleaner cover rubber
(7) fuel tank band
(8) crankcase breather tube
6. Remove the old gasket from exhaust pipe.
7. Install the muffler clamp (9) by aligning the
tab (10) of the muffler clamp with the cut-out
(11) of the muffler (12).
(9) muffler clamp (11) cut-out
(10) tab (12) muffler
8. Install the new gasket (13) as shown.
(13) gasket
9. Install the muffler (12).
(12) muffler
(14) muffler B bolt/washer
(15) muffler A bolt
(16) muffler clamp bolt
12.Install the side covers (17), side cover bolts
and collars (18).
13.Install the seat (page 29).
(17) side cover
(18) side cover bolts/collars
(5) (7) (6)
(8)(4)
(11)
(10)
(9)
(12)
(13)
(12)
(15) (16)
(14)
(17) (18)
10. Tighten the muffler B bolt/washer (14) and
muffler A bolt (15) to the specified torque:
19 lbf·ft (26 N·m, 2.7 kgf·m)
11. Tighten the muffler clamp bolt (16) to the
specified torque:
15 lbf·ft (21 N·m, 2.1 kgf·m)
34 Servicing Your Honda
Fuel System
Refer to Safety Precautions on page 19.
Fuel Recommendation
We recommend that you use unleaded fuel
because it produces fewer engine deposits and
extends the life of exhaust system components.
Your engine is designed to use any gasoline that
has a pump octane number of 91 or higher.
Gasoline pumps at service stations normally
display the pump octane number. For
information on the use of oxygenated fuels, see
page 144.
Use of lower octane gasoline can cause persistent
“pinging” or “spark knock” (a louder rapping
noise) which, if severe, can lead to engine
damage. (Light pinging experienced while
operating under a heavy load, such as climbing a
hill, is no cause for concern.)
If pinging or spark knock occurs at a steady
engine speed under normal load, change brands
of gasoline. If pinging or spark knock persists,
consult your Honda dealer.
Never use stale or contaminated gasoline. Avoid
getting dirt, dust, or water in the fuel tank.
Type Unleaded
Pump Octane Number 91 (or higher)
Refueling Procedure
Fuel Tank Capacity: 1.9 US gal (7.3 liter)
(1) fuel fill cap (3) steering stem nut
(2) breather tube
1. To open the fuel fill cap (1), pull the breather
tube (2) out of the steering stem nut (3). Turn
the fuel fill cap counterclockwise and remove
it.
2. Add fuel until the level reaches the bottom of
the filler neck. Avoid overfilling the tank.
There should be no fuel in the filler neck.
WARNING
Gasoline is highly flammable and
explosive. You can be burned or
seriously injured when handling fuel.
• Stop the engine and keep heat, sparks
and flame away.
• Handle fuel only outdoors.
• Wipe up spills immediately.
Fuel Valve and Hose
(1) fuel valve (3) fuel line
(2) fuel filter
1. Check the fuel valve (1) and fuel filter (2) for
contamination.
2. Check for leaks.
3. Check the fuel line (3) for cracks,
deterioration, damage, or leakage. Replace the
fuel line, if necessary.
4. Check for interference between the frame and
tank and adjust if necessary.
(2)
(3)
(1)
(3)
(1)
(2)
(3)
Servicing Your Honda 35
Fuel System
Fuel Filter
The fuel filter is mounted on the bottom left side
of the fuel tank. Dirt accumulated in the filter
will restrict the flow of the fuel to the carburetor.
To service the fuel filter:
1. Drain the fuel from the fuel tank into an
approved gasoline container.
2. Remove the fuel tank (page 30).
3. Remove the fuel filter (1) from fuel tank by
removing the bolts (2). Wash the fuel filter in
high flash-point cleaning solvent.
4. Reassemble the fuel filter in the reverse order
of removal. Make sure the O-ring (3) is in
place. Install the fuel filter in the fuel tank.
Refill the fuel tank.
Attach the fuel valve and fuel line, and turn
the fuel valve to ON; check for leaks.
(1) fuel filter (3) O-ring
(2) bolts
(3)
(1)
(2)
36 Servicing Your Honda
* Suggested 4-stroke engine oils are equal
performance to SJ oils that are not labeled as
energy conserving on the circular API service
label.
Engine Oil
Refer to Safety Precautions on page 19.
Using the proper oil, and regularly checking,
adding, and changing oil will help extend the
service life of the engine’s life. Even the best oil
wears out. Changing oil helps get rid of dirt and
deposits. Operating the engine with old or dirty
oil can damage your engine. Running the engine
with insufficient oil can cause serious damage to
the engine.
Oil Recommendation
API
classification
SG or higher except oils
labeled as energy conserving
on the circular API service
label
suggested oil*
Pro Honda GN4, HP4
(without molybdenum
additives) or HP4M (with
molybdenum additives)
4-stroke oil, or an equivalent*
viscosity
(weight)
SAE 10W–40
JASO T 903 MA or MB
• Your motorcycle does not need oil additives.
Use the recommended oil.
• Do not use API SH or higher 4-stroke engine
oils displaying a circular API “energy
conserving” service label on the container. They
may affect lubrication.
Other viscosities shown in the following chart
may be used when the average temperature in
your riding area is within the indicated range.
NOT RECOMMENDED OK
Servicing Your Honda 37
Engine Oil
JASO T 903 standard
The JASO T 903 standard is an index to choose
engine oils for 4-stroke motorcycle engines.
There are two classes: MA and MB.
Oil conforming to the standard has the following
classification on the oil container.
(1) code number of the sales company of the oil
(2) oil classification
Checking & Adding Oil
(1) engine oil filler cap/dipstick
(2) upper level mark
(3) lower level mark
1. Run the engine at idle for 3 minutes, then shut
it off.
2. Wait 3 minutes after shutting off the engine to
allow the oil to properly distribute itself in the
engine.
3. Support the CRF in an upright position on a
level surface.
4. Remove the engine oil filler cap/dipstick (1),
wipe it clean, and insert the oil filler
cap/dipstick without screwing it in, Remove
the oil filler cap/dipstick.
5. Check that the oil level is between the upper
(2) and lower (3) level marks on the oil filler
cap/dipstick.
• If the oil is at or near the upper level mark,
you do not have to add oil.
• If the oil is below or near the lower level
mark and add the recommended oil until
the upper level mark. (Do not overfill)
Reinstall the engine oil filler cap/dipstick.
Repeat steps 1–5.
6. Reinsert the engine oil filler cap/dipstick.
7. Check for oil leaks.
Changing Engine Oil & Filter
1. Run the engine at idle for 3 minutes, then shut
it off.
2. Support the CRF in an upright position on a
level surface.
3. Remove the engine oil filler cap/dipstick (1)
from the left crankcase cover.
4. Place an oil drain pan under the engine to
catch the oil. Then remove the engine oil
drain bolt (2) and sealing washer (3).
5. With the engine stop button pushed, repeat
kickstarter operation approximately 5 times to
drain the engine oil completely.
6. After the oil has drained, tighten the engine
oil drain bolt with a new sealing washer to the
specified torque:
16 lbf·ft (22 N·m, 2.2 kgf·m)
(1) engine oil filler cap/dipstick
(2) engine oil drain bolt
(3) sealing washer
7. It is recommended to replace the oil and filter
every 6 races or about every 15.0 hours.
However, if you replace only the oil before
the recommended interval, see page 21.
(2)
(2)
(1)
(1)
(2)
(1)
(3)
(1)
(3)
(2)
(cont’d)
38 Servicing Your Honda
Engine Oil
8. Remove the left engine guard bolt (4) and left
engine guard (5).
12.Apply grease to the seat face of spring (10).
13.Position the spring against the engine
crankcase and install a new oil filter with the
rubber seal (11) facing out, away from the
engine. You should see the ”OUT-SIDE” mark
(12) on the filter body, near the seal.
Use a new genuine Honda oil filter or a filter
of equal quality specified for your model.
If the oil filter is not installed properly, it will
cause serious engine damage.
14.Install the oil filter cover O-ring and oil filter
cover being careful not to damage the O-ring,
then tighten the oil filter cover bolts to the
specified forque:
9 lbf·ft (12 N·m, 1.2 kgf·m)
15.Install the left engine guard and left engine
guard bolt.
16.Fill the crankcase with the recommended oil.
Capacity:
0.73 US qt (0.69R)
at oil and filter change
0.70 US qt (0.66R)
at oil change
17.Install the engine oil filler cap/dipstick.
18.Check the engine oil level by following the
steps in
Checking & Adding oil (page 37).
NOTICE
(4) left engine guard bolt
(5) left engine guard
9. Remove the oil filter cover bolts (6) and oil
filter cover (7).
(6) oil filter cover bolts
(7) oil filter cover
(8) oil filter
(9) oil filter cover O-ring
(10) spring
(11) rubber seal
(12) “OUT-SIDE” mark
(5)
(4)
(10)
(12)
(9)
(8)
(11)
(7)
(6)
10. Remove the oil filter (8) from the cover.
11. Check that the oil filter cover O-ring (9) is in
good condition.
Servicing Your Honda 39
Refer to Safety Precautions on page 19.
Using the proper oil, and regularly checking,
adding, and changing oil will help extend the
service life of the transmission and clutch. Even
the best oil wears out. Changing oil helps get rid
of dirt and deposits. Operating the engine with
old or dirty oil can damage your engine.
Running the engine with insufficient oil can
cause serious damage to the engine and
transmission.
Oil Recommendation
• Your CRF does not need oil additives. Use the
recommended oil.
• Do not use oils with graphite or molybdenum
additives. They may adversely affect clutch
operation.
• Do not use API SH or higher 4-stroke engine
oils displaying a circular API “energy
conserving” service label on the container. They
may affect lubrication and clutch performance.
* Suggested 4-stroke engine oils are equal
performance to SJ oils that are not labeled as
energy conserving on the circular API service
label.
Type
API classification
(4-stroke engine oil
only)
Viscosity
(weight)
JASO T903
standard
others
suggested oil*
transmission oil or 4-stroke
engine oil
SG or higher except oils
labeled as energy
conserving on the circular
API service label
SAE 10W–40
MA
without friction modifiers as
molybdenum additives
Pro Honda HP Trans oil,
Pro Honda GN4 or HP4
(without molybdenum
additives) 4-stroke engine
oil or an equivalent*
Transmission Oil
Other viscosities shown in the following chart
may be used when the average temperature in
your riding area is within the indicated range.
NOT RECOMMENDED OK
(cont’d)
40 Servicing Your Honda
JASO T 903 standard
The JASO T 903 standard is an index to choose
engine oils for 4-stroke motorcycle engines.
There are two classes: MA and MB.
Oil conforming to the standard has the following
classification on the oil container.
(1) code number of the sales company of the oil
(2) oil classification
Checking & Adding Oil
(1) transmission oil filler cap
(2) oil check bolt
1. Run the engine at idle for 3 minutes, then shut
it off.
2. Wait 3 minutes after shutting off the engine to
allow the oil to properly distribute itself in the
clutch and transmission.
3. Support the CRF in an upright position on a
level surface.
4. Remove the transmission oil filler cap (1) and
oil check bolt (2) from the right crankcase
cover. A small amount of oil should flow out
of the oil check bolt hole. Allow any excess
oil to flow out of the oil check bolt hole.
If no oil flows out of the oil check bolt hole,
add oil slowly through the transmission oil
filler hole until oil start to flow out of the oil
check bolt hole.
Install the oil check bolt and transmission oil
filler cap. Repeat step 1–4.
5. After inspection the oil level or adding oil,
tighten the oil check bolt to the specified
torque:.
Oil Check Bolt:
7 lbf·ft (10 N·m, 1.0 kgf·m)
6. Install the transmission oil filler cap securely.
Replacing Transmission Oil
1. Run the engine at idle for 3 minutes, then shut
it off.
2. Support the CRF in an upright position on a
level surface.
3. Remove the transmission oil filler cap (1)
from the right crankcase cover.
4. Place an oil drain pan under the engine to
catch the oil. Then remove the transmission
oil drain bolt (2) and sealing washer (3).
5. After the oil has drained, install the
transmission oil drain bolt with a new sealing
washer to the specified torque:
16 lbf·ft (22 N·m, 2.2 kgf·m)
6. Fill the crankcase with recommended oil.
Capacity:
0.63 US qt (0.60R) at oil change
7. Check the transmission oil level by following
the steps in
checking & Adding Oil (this
page).
Transmission Oil
(2)
(2)
(1)
(1)
(2)
(1)
(3)
(2)
(1) transmission oil filler cap
(2) transmission oil drain bolt
(3) sealing washer
Servicing Your Honda 41
Your CRF’s liquid cooling system dissipates
engine heat through the coolant jacket that
surrounds the cylinder and cylinder head.
Maintaining the coolant will allow the cooling
system to work properly and prevent freezing,
overheating, and corrosion.
Coolant Recommendation
Use Pro Honda HP coolant or an equivalent high
quality ethylene glycol antifreeze containing
corrosion protection inhibitors specifically
recommended for use in aluminum engines.
Check the antifreeze container label.
Use only distilled water as a part of the coolant
solution. Water that is high in mineral content or
salt may be harmful to the aluminum engine.
Using coolant with silicate inhibitors may cause
premature wear of radiator pump seals or
blockage of radiator passages. Using tap water
may cause engine damage.
The factory provides a 50/50 solution of
antifreeze and water in this motorcycle. This
coolant solution is recommended for most
operating temperatures and provides good
corrosion protection.
Decreasing the concentration of antifreeze to less
than 40% will not provide proper corrosion
protection.
Increasing the concentration of antifreeze is not
recommended because it decreases cooling
system performance. Higher concentrations of
antifreeze (up to 60%) should only be used to
provide additional protection against freezing.
Check the cooling system frequently during
freezing weather.
Checking & Adding Coolant
Refer to Safety Precautions on page 19.
1. With the engine cold, remove the radiator cap
(1) and check coolant level. The coolant level
is correct when it is at the bottom of the
radiator filler neck.
(1) radiator cap
2. Add coolant up to the filler neck if the level is
low.
Inspect the coolant level before each outing.
A coolant loss of 0.7 - 2.0 US oz (20 - 60
cm
3
) through the over flow tube is normal. If
coolant loss is more than this, inspect the
cooling system.
Capacity:
1.06 US qt (1.00R) at disassembly
0.98 US qt (0.93R) at coolant change
3. Install the radiator cap securely.
If the radiator cap is not installed properly, it
will cause excessive coolant loss and may result
in overheating and engine damage.
NOTICENOTICE
Coolant
WARNING
Removing the radiator cap while the
engine is hot can allow the coolant to
spray out, seriously scalding you.
Always let the engine and radiator cool
down before removing the radiator cap.
(1)
42 Servicing Your Honda
Cooling System Inspection
1. Check the cooling system for leaks (see the
Honda Service Manual for troubleshooting of
leaks).
2. Check water hoses (1) for cracks,
deterioration, and clamp bands for looseness.
3. Check the radiator mount for looseness.
4. Make sure the overflow tube (2) is connected
and not clogged.
5. Check the radiator fins for clogging.
6. Check the water leakage check hole (3) below
the water pump cover (4) for leakage. Make
sure the hole remains open. If water leaks
through the check hole, the water pump seal is
damaged. If oil leaks through the check hole,
the engine oil seal is damaged. See the
Honda Service Manual or consult your Honda
dealer for replacing the water pump seal or
the engine oil seal. Both seals should be
replaced at the same time.
Coolant Replacement
Refer to Safety Precautions on page 19.
Coolant should be replaced by your Honda
dealer, unless you have the proper tools and
service data and are mechanically qualified.
Refer to the official Honda Service Manual
(page 152).
To properly dispose of drained coolant, refer to
You & the Environment, page 134.
Improper disposal of drained fluids is harmful to
the environment.
NOTICE
Coolant
WARNING
Removing the radiator cap while the
engine is hot can allow the coolant to
spray out, seriously scalding you.
Always let the engine and radiator cool
down before removing the radiator cap.
(2)
(1)
(4)
(3)
(1) water hoses
(2) overflow tube
(3) water leakage check hole
(4) water pump cover
Servicing Your Honda 43
Air Cleaner
Refer to Safety Precautions on page 19.
The air cleaner uses polyurethane inner and outer
pieces which can’t be separated.
A dirty air cleaner will reduce engine power.
Proper air cleaner maintenance is very important
for off-road vehicles. A dirty, water-soaked,
worn-out, or defective air cleaner will allow dirt,
dust, mud, and other impurities to pass into the
engine.
Service the air cleaner more frequently if you
ride in unusually wet or dusty areas. Your Honda
dealer can help you determine the correct service
interval for your riding conditions.
Your CRF’s air cleaner has very specific
performance requirements. Use a new genuine
Honda air cleaner specified for your model or an
air cleaner of equal quality.
Using the wrong air cleaner can result in
premature engine damage.
Proper air cleaner maintenance can prevent
premature engine wear or damage, expensive
repairs, low engine power, poor gas mileage, and
spark plug fouling.
Improper or lack of proper air cleaner
maintenance can cause poor performance and
premature engine wear.
NOTICE
NOTICE
Cleaning
1. Remove the seat (page 29).
2. Loosen the air cleaner retaining bolt (1).
3. Align the two access top tabs (2) of the air
cleaner (3) and ”
∆” mark (4) of the air
cleaner housing by rotating the air cleaner
counterclockwise.
5. Remove the air cleaner from the air cleaner
holder (5).
(1) air cleaner retaining bolt
(2) two access top tabs
(3) air cleaner
(4) ”
∆” mark
4. Remove the air cleaner with the retaining bolt,
keeping the two access top tabs up.
(1) air cleaner retaining bolt
(3) air cleaner (5) air cleaner holder
(6) holder tab (7) hole
(8) air cleaner tab
6. Wash the air cleaner in clean non-flammable
cleaning solvent. Then wash in hot, soapy
water, rinse well, and allow to dry thoroughly.
The air cleaner is made in two pieces: inner
and outer, which cannot be separated.
7. Clean the inside of the air cleaner housing.
8. Allow the air cleaner to dry thoroughly. After
drying, soak the air cleaner in clean Pro
Honda Foam Filter Oil or an equivalent air
cleaner oil.
Apply air cleaner oil to the entire surface,
inner and outer, and rub it with both hands to
saturate the air cleaner with oil. Squeeze out
excess oil.
(cont’d)
(4)
(1)
(2)
(3)
(8)
(6)
(3)
(1)
(7)
(5)
44 Servicing Your Honda
Air Cleaner
Improper installation of the air cleaner assembly
may allow dirt and dust to enter the engine and
cause rapid wear of the piston rings and cylinder.
12.Reinstall the seat (page 29), making sure it is
securely attached.
NOTICE
9. Apply a thin coat of Honda White Lithium
Grease to the sealing surface.
(1) air cleaner retaining bolt
(2) two access top tabs
(3) air cleaner
(4) ”
∆” mark
(9) set tab
(2)
(4)
(9)
(3)
(1)
(8)
(6)
(3)
(1)
(7)
(5)
11.Install the assembly into the air cleaner
housing keeping the two access top tabs (2)
up.
12.Carefully position the sealing flange of the
element to prevent dirt intrusion.
13.Align the set tab (9) of the air cleaner with the
”
∆” mark (4) of the air cleaner housing by
rotating the air cleaner clockwise. Tighten the
retaining bolt (1) securely.
(1) air cleaner retaining bolt
(3) air cleaner (7) hole
(5) air cleaner holder (8) air cleaner tab
(6) holder tab
10. Assemble the air cleaner (3) and holder (5).
Install the tab (6) of the holder in the hole (7)
of the air cleaner tab (8), and the air cleaner
retaining bolt (1) through the assembly.
Crankcase Breather
Servicing Your Honda 45
Refer to Safety Precautions on page 19.
Service more frequently if your CRF is ridden in
the rain or often at full throttle.
Service the breather if you can see deposits in the
transparent section of the drain tube.
Draining
1. Remove the crankcase breather tube plug (1)
from the tube (2) and drain deposits.
2. Reinstall the crankcase breather tube plug.
(1) crankcase breather tube plug
(2) tube
(2)
(1)
46 Servicing Your Honda
Throttle
Refer to Safety Precautions on page 19.
Throttle Freeplay
(1) freeplay
Inspection
Check freeplay (1).
Freeplay:
1/8 - 3/16 in (3 - 5 mm)
If necessary, adjust to the specified range.
Upper
Adjustment
Minor adjustments are generally made with the
upper adjuster.
Lower
Adjustment
The lower adjuster is used for major freeplay
adjustment, such as after replacing the throttle
cables or removing the carburetor. It is also used
if you can not get the proper adjustment with the
upper adjuster.
(1)
(2)
(4)
(3)
(+)
(–)
(5) lock nut (+) increase
(6) adjuster (–) decrease
1. Remove the fuel tank (page 30).
2. loosen the lock nut (5).
3. Turn the adjuster (6) in direction (–) to
decrease freeplay, and in direction (+) to
increase freeplay.
4. Tighten the lock nut.
5. Operate the throttle grip to ensure that it
functions smoothly and returns completely.
6. Install the fuel tank (page 31).
If you can’t get the freeplay within the specified
range, contact your Honda dealer.
(5)
(6)
(+)
(–)
1. Pull the rubber dust cover (2) back.
2. Loosen the upper lock nut (3).
3. Turn the upper adjuster (4).
Turning the adjuster in direction (–) will
decrease freeplay and turning it in direction
(+) will increase freeplay.
4. Tighten the lock nut. Return the dust cover to
its normal position.
5. After adjustment, check for smooth rotation of
the throttle grip from fully closed to fully
open in all steering positions.
If the adjuster is threaded out near its limit or
the correct freeplay cannot be reached, turn
the adjuster all the way in and back out one
turn. Tighten the lock nut, install the dust
cover and make the adjustment with the
lower adjuster.
(2) dust cover (+)increase
(3) lock nut (–)decrease
(4) upper adjuster
Servicing Your Honda 47
Throttle
Throttle Inspection
(1) throttle
1. Check that the throttle assembly is positioned
properly and the securing bolts are tight.
2. Check for smooth rotation of the throttle (1)
from fully open to fully closed in all steering
positions. If there is a problem, see your
Honda dealer.
3. Inspect the condition of the throttle cables
from the throttle grip down to the carburetor.
If the cable is kinked or chafed, have it
replaced.
4. Check the cables for tension or stress in all
steering positions.
5. Lubricate the cables with a commercially-
available cable lubricant to prevent premature
rust and corrosion.
(1)
Engine Idle Speed
48 Servicing Your Honda
The best way to assure proper carburetion is to
see your Honda dealer for regularly scheduled
servicing, including carburetor adjustment.
Remember, idle speed adjustment is not a
“cure-all” for other problems in your engine’s
fuel-delivery system. Adjusting the idle will not
compensate for a fault elsewhere.
The engine must be at normal operating
temperature for accurate idle speed adjustment.
For information about high altitude carburetor
adjustment, see page 143.
Idle Speed Adjustment
Refer to Safety Precautions on page 19.
1. Turn the pilot screw (1) in until it is lightly
seated and record the number of turns. Turn
the pilot screw out the same number of turns.
2. If the engine is cold, start it and warm it up
three minutes. Then shut it off.
3. Connect a tachometer to the engine.
4. Shift into neutral. Start the engine.
5. Keep the motorcycle in an upright position.
6. Adjust idle speed with the throttle stop screw
(2).
Idle speed:
1,700 ± 100 rpm
(1)
(1) pilot screw
(2)
(2) throttle stop screw
Servicing Your Honda 49
Clutch System
Refer to Safety Precautions on page 19.
Clutch Lever Adjustment
The distance between the tip of the clutch lever
and the grip may be adjusted.
Make sure to adjust the clutch lever freeplay after
the clutch lever position adjustment or clutch
cable disconnected.
(1) lock nut (2) adjuster
1. Loosen the lock nut (1).
2. To position the clutch lever farther away from
the handgrip, turn the adjuster (2)
counterclockwise. To position the clutch lever
closer to the handgrip, turn the adjuster
clockwise.
3. Tighten the lock nut.
4. Adjust the clutch lever freeplay.
Clutch Freeplay
(1) clutch lever
Inspection
Check freeplay.
Freeplay:
3/8 – 3/4 in (10 – 20 mm)
If necessary, adjust to the specified range.
Improper freeplay adjustment can cause
premature clutch wear.
Cable End
Adjustment
Minor adjustments are generally made with the
clutch cable end adjuster.
Cable end adjuster:
(2) cable end adjuster
(+) increase free play
(–) decrease free play
1. Turn the cable end adjuster (2) to obtain the
specified freeplay.
2. Check the freeplay again.
If the adjuster is threaded out near its limit and
the correct freeplay cannot be reached, turn the
adjuster in direction (+) until it seats lightly and
then turn it out one turn in direction (–). Make
the adjustment with the integral cable adjuster.
Integral Cable
Adjustment
The integral cable adjuster is used if the cable
end adjuster is threaded out near its limit — or
the correct freeplay cannot be obtained.
(3) lock nut (+) increase
(4) cable adjuster (–) decrease
(5) cable end adjuster
1. Turn the cable end adjuster (5) in direction (+)
until it seats lightly and then turn it out 5 turns.
2. Loosen the lock nut (3).
3. Turn the integral cable adjuster (4) to obtain
the specified freeplay 3/8 – 3/4 in (10 – 20
mm).
4. Tighten the lock nut. Check the freeplay.
5. Start the engine, pull the clutch lever in, and
shift into gear. Make sure the engine does not
stall and the motorcycle does not creep.
Gradually release the clutch lever and open
the throttle. Your CRF should move smoothly
and accelerate gradually.
If you can’t get proper adjustment, or the clutch
does not work properly, the cable may be kinked
or worn, or the clutch discs may be worn. See
your Honda dealer or refer to the official Honda
Service Manual (page 152).
(1)
(2)
(1)
(2)
(–)
(+)
(4)
(3)
(5)
(–)
(+)
50 Servicing Your Honda
Clutch System
Other Inspections & Lubrication
• Check that the clutch lever assembly is
positioned properly and the securing bolts are
tight.
• Check the clutch cable for kinks or signs of
wear. If necessary, have it replaced.
• Lubricate the clutch cable with a
commercially-available cable lubricant to
prevent premature wear and corrosion.
Clutch Operation
1. Check for smooth clutch lever operation. If
necessary, lubricate the clutch lever pivot or
clutch cable.
2. Check the clutch cable for deterioration,
kinks, or damage.
Clutch Cover/Disc/Plate Removal
1. Drain the transmission oil (page 40).
2. Remove the rear brake pedal (1) by removing
its pivot bolt (2).
(1) rear brake pedal (2) pivot bolt
3. Remove the five clutch cover bolts (3) and
clutch cover (4).
(3) clutch cover bolts (4) clutch cover
4. Remove the five clutch spring bolts (5) and
clutch springs.
Loosen the bolts in a crisscross pattern in 2 or 3
progressive steps.
5. Remove the clutch pressure plate (6).
(5) clutch spring bolts (6) clutch pressure plate
6. Remove the clutch lifter (7) and clutch lifter
rod (8).
7. Remove the eight clutch discs and seven
clutch plates (9).
Turn the lifter bearing plate of the clutch lifter
bearing with your finger. The bearing plate
should turn smoothly and quietly. Discard the
clutch lifter if the bearing plate does not turn
smoothly.
(7) clutch lifter (9) clutch discs and plates
(8) clutch lifter rod
(2)
(1)
(3)
(4)
(5)
(6)
(7)
(9)
(8)
Servicing Your Honda 51
Clutch System
Clutch Disc Inspection
Replace the clutch discs (1) if they show signs of
scoring or discoloration.
Measure the thickness of each clutch disc.
Service Limit:
0.112 in (2.85 mm)
Replace the clutch discs and clutch plates as an
assembly.
(1) clutch disc
Clutch Spring Inspection
(1) clutch spring
Measure the free length of each spring.
Service Limit:
1.46 in (37.2 mm)
If one or more springs are beyond the service
limit, replace the springs as a set.
Clutch Disc/Plate Installation
1. Coat the clutch plates (1) with transmission
oil.
2. Install the eight clutch discs (2) and seven
clutch plates alternately, starting with a clutch
disc.
(1) clutch plates (2) clutch discs
3. Apply grease to the clutch lifter rod (3).
4. Insert the clutch lifter rod into the mainshaft.
5. Install the clutch lifter (4) onto the rod.
(3) clutch lifter rod (4) clutch lifter
6. Install the clutch pressure plate (5).
7. Install the five clutch springs and bolts (6).
8. Tighten the bolts in a crisscross pattern in 2 or
3 steps, to the specified torque:
9 lbf·ft (12 N·m, 1.2 kgf·m)
(5) clutch pressure plate (6) clutch spring bolts
9. Install a new O-ring (7) in the groove of the
clutch cover (8).
(7) O-ring (8) clutch cover
(1)
(1)
(2) (1)
(4)
(3)
(5)
(6)
(8)
(7)
(cont’d)
10. Install the cover by tightening the five cover
bolts to the specified torque:
7 lbf·ft (10 N·m, 1.0 kgf·m)
52 Servicing Your Honda
Clutch System
11. Lubricate the O-ring (9), rear brake pedal (10)
pivot and pivot bolt (11) with Honda Lithium
Grease and tighten the pivot bolt to the
specified torque:
27 lbf·ft (37 N·m, 3.8 kgf·m)
Connect the brake pedal return spring (12) if
it was removed.
(9) O-ring (11) pivot bolt
(10) rear brake pedal (12) return spring
12.Fill the crankcase with transmission oil (page
40).
(12)
(10)
(11) (9)
Servicing Your Honda 53
Hot Start Lever
Refer to Safety Precautions on page 19.
Hot Start Lever Freeplay
left handlebar
(1) hot start lever
(2) hot start lever freeplay
Inspection
Check freeplay:
1/16 – 1/8 in (2 – 3 mm)
If necessary, adjust to the specified range.
Adjustment
Adjustments can be made with the cable end
adjuster.
Loosen the lock nut (3) and turn the adjuster (4).
Turning the adjuster clockwise (+) will increase
free play and turning it counterclockwise (–) will
decrease free play. After adjustment, tighten the
lock nut.
(3) lock nut (+) increase
(4) cable adjuster (–) decrease
(1) (2)
(4)
(–)
(+)
(3)
Refer to Safety Precautions on page 19.
Spark Plug Recommendation
The recommended standard spark plug is
satisfactory for most racing conditions.
Use only the recommended type of spark plugs in
the recommended heat range.
Using a spark plug with an improper heat range
or incorrect reach can cause engine damage.
Using a non-resistor spark plug may cause
ignition problems.
This motorcycle uses a spark plug that has an
iridium tip in the center electrode and a platinum
tip in the side the electrode .
Be sure to observe the following when servicing
the spark plug.
• Do not clean the spark plug. If an electrode is
contaminated with accumulated objects or
dirt, replace the spark plug with a new one.
• Use only a “wire-type feeler gauge” to check
the spark plug if necessary. To prevent
damaging the iridium tip of the center
electrode and platinum tip of the side
electrode, never use a “leaf-type feeler
gauge’’.
• Do not adjust the spark plug gap. If the gap is
out of specification, replace the spark plug
with a new one.
NOTICE
54 Servicing Your Honda
Spark Plug
Spark Plug Replacement & Inspection
Refer to Safety Precautions on page 19.
1. Remove the seat and fuel tank (pages 29,30).
2. Disconnect the spark plug cap (1).
3. Clean any dirt from around the spark plug bases.
4. Remove the spark plug (2).
7. To obtain accurate spark plug readings,
accelerate up to speed on a straightaway. Push
the engine stop button and disengage the
clutch by pulling the lever in.
Coast to a stop, then remove and inspect the
spark plug. The porcelain insulator around the
center electrode should appear tan or medium
gray.
If you're using a new plug, ride for at least ten
minutes before taking a plug reading; a brand-new
plug will not color initially.
If the electrodes appear burnt, or the insulator is
white or light gray (lean) or the electrodes and
insulator are black or fouled (rich), there is a
problem elsewhere (page 122).
Check the carburetor, fuel system and ignition
timing.
8. Tighten the spark plug
If the old plug is good:
1/8 turn after it seats.
If installing a new plug, tighten it twice to
prevent loosening:
a) First, tighten the plug:
NGK: 1/2 turn after it seats.
b) Then loosen the plug.
c) Next, tighten the plug again:
1/8 turn after it seats.
9. Connect the spark plug cap.
(1) spark plug cap
(2) spark plug
5. Check the electrode for wear or deposits, the
gasket (3) for damage, and the insulator for
cracks. Replace if you detect them.
6. Check the spark plug gap (4), using a wire-type
feeler gauge. If the gap is out of specifications,
replace the plug with a new one.
The recommended spark plug gap is:
0.024 – 0.028 in (0.6 – 0.7 mm)
(3) sealing gasket
(4) spark plug gap
(1)
(2)
(3)
(4)
Standard
For extend high
speed riding
R0409B-8 (NGK)
R0409B-9 (NGK)
10. Install the fuel tank and seat (page 31).
Servicing Your Honda 55
Valve Clearance
Cylinder Head Cover Removal
Before inspection, clean the engine thoroughly to
keep dirt from entering the engine.
1. Remove the seat (page 29).
2. Remove the fuel tank (page 30).
3. Disconnect the breather tube (1) and spark
plug cap (2).
Positioning At Top Dead Center On The
Compression Stroke.
1. Remove the crankshaft hole cap (1).
(1) breather tube (2) spark plug cap
4. Remove the cylinder head cover bolts (3), and
cylinder head cover (4).
(3) cylinder head cover bolts
(4) cylinder head cover
(1) crankshaft hole cap
2. Remove the spark plug (2).
(2) spark plug
(2)
(1)
(4)
(3)
(1)
(2)
(cont’d)
Refer to
Safety Precautions on page 19.
Excessive valve clearance will cause noise and
eventual engine damage. Little or no clearance
will prevent the valve from closing and cause
valve damage and power loss. Check the valve
clearance when the engine is cold at the intervals
specified in the Maintenance Schedule.
The checking or adjusting of the clearance should
be performed while the engine is cold.
The clearance will change as engine temperature
rises.
Valve Clearance
56 Servicing Your Honda
Valve Clearance Inspection
1. Measure the intake valve clearance by
inserting a feeler gauge (1) between the valve
lifters (2) and intake cam lobe (3).
2. Measure the exhaust valve clearance by
inserting a feeler gauge (1) between the
exhaust rocker arm (4) and shim (5).
(1) feeler gauge
(4) exhaust rocker arm
(5) exhaust valve shim
Valve Clearances:
IN:
0.005 ± 0.001 in (0.12 ± 0.03 mm)
EX: 0.011 ± 0.001 in (0.28 ± 0.03 mm)
If intake valve clearance and exhaust valve
clearance need adjustment, see
Camshaft
Removal
(page 57) and select the correct shim for
each valve.
(6)
(1)
(3)
(2)
(1)
(5)
(4)
(1) feeler gauge
(2) valve lifters
(3) intake cam lobe
3. Rotate the crankshaft by turning the primary
drive gear lock bolt (3) (crankshaft) clockwise
until aligning the “punch” mark (4) on the
primary drive gear with the index mark (5) on
the right crankcase cover. In this position, the
piston may either be on the compression or
exhaust stroke.
If the crankshaft passed the “punch” mark,
rotate the primary drive gear lock bolt
clockwise again and align the “punch” mark
with the index mark.
The inspection must be made when the piston
is at the top of the compression stroke when
both the intake and exhaust valves are closed.
This condition can be determined by moving
the exhaust rocker arm (6). If it is free, it is an
indication that the valves are closed and that
the piston is on the compression stroke. If it is
tight and the valves are open, rotate the
primary drive gear lock bolt 360° and realign
the “punch” mark to the index mark.
(3)
(5)
(4)
(3) primary drive gear lock bolt (5) index mark
(4) “punch” mark
(6) exhaust rocker arm
Servicing Your Honda 57
Valve Clearance
CamShaft Removal
1. Record the intake valve clearance and exhaust
valve clearance.
2. Remove the cam chain tensioner lifter cover
bolt (1) and sealing washer (2).
(1) cam chain tensioner lifter cover bolt
(2) sealing washer
3. Make a tensioner shaft stopper tool (3) out of
a thin piece of steel (0.8 mm thick) using the
diagram.
4. Turn the tensioner shaft clockwise with the
stopper tool (3) until it stops, in order to
retract the tensioner fully.
Then insert the stopper tool fully to hold the
stopper in the fully retracted position.
(3) stopper tool
(2)
(1)
12.0 mm7.0 mm
8.5 mm
3.5 mm
(3)
(3)
(3)
(cont’d)
Valve Clearance
58 Servicing Your Honda
8. Remove the shims (8).
(8) shims
(8)
5. Remove the camshaft holder bolts (4) and
camshaft holders (5).
Loosen the camshaft holder bolts in a criss-cross
pattern in 2 or 3 steps.
6. Remove the camshaft (6), and then attach a
piece of wire to the cam chain to prevent it
from falling into the crankcase.
Be careful to not let the set rings of the camshaft
holders fall into the crankcase.
(4) camshaft holder bolts (6) camshaft
(5) camshaft holders
7. Remove the valve lifters (7).
Position the removed intake valve lifters and
shims to indicate their location such as intake or
exhaust, right or left.
Do not let the valve lifters and shims fall into the
crankcase.
NOTICE
(7) valve lifters
(6)
(4)
(5)
(4)
(7)
Servicing Your Honda 59
Valve Clearance
Shim Selection
1. Clean the valve shim contact area in the valve
lifter (1) with compressed air.
(1) valve lifter
2. Measure the shim thickness and record it.
Seventy-three different thickness shims (2) are
available from the thinnest (1.200 mm
thickness) shim to the thickest (3.000 mm
thickness) in intervals of 0.025 mm.
3. Calculate the new shim thickness using the
equation below.
A = (B – C) + D
A: New shim thickness
B: Recorded valve clearance
C: Specified valve clearance
D: Old shim thickness
• Make sure of the correct shim thickness by
measuring the shim with the micrometer.
• Reface the intake valve seat if carbon deposits
result in a calculated dimension of over 2.450
mm.
Reface the exhaust valve seat if carbon
deposits result in a calculated dimension of
over 3.000 mm.
(1)
(2)
(2) shim
Valve Clearance
60 Servicing Your Honda
5. Place the cam sprocket (7) and align the
timing mark (8) on the cam sprocket with the
surface of the cylinder head (9).
Install the cam chain over the sprocket
without rotating the sprocket.
(4) primary drive gear lock bolt
(5) “punch” mark
(6) index mark
(7) cam sprocket
(8) timing mark
(9) surface of the cylinder head
(4) (5) (6)
(8)
(7)
(9)
(8)
Camshaft Installation
1. Install the newly selected shims (1) on the
valve retainers (2).
Do not let the shims fall into the crankcase.
NOTICE
(1) shims (2) valve retainers
2. Apply molybdenum disulfide oil (a mixture of
1/2 engine oil and 1/2 molybdenum disulfide
grease (containing more than 3%
molybdenum disulfide additive)) to the
camshaft and outer surface of the each the
valve lifters (3).
3. Install the valve lifters and camshaft into the
camshaft holder assembly.
(3) valve lifters
4. Rotate the primary drive gear lock bolt (4)
(crankshaft) clockwise and align the “punch”
mark (5) with the index mark (6).
(2)
(2)
(1)
(3)
Servicing Your Honda 61
Valve Clearance
6. Apply grease to the set rings and install it
onto the camshaft holders (10).
Install the cam shaft holders onto the cylinder
head with the intake cam lobes (12) facing up
as illustrated below.
Apply the oil to the camshaft holder bolt
threads and seating surface.
Tighten the camshaft holder bolts (11) to the
specified torque:
12 lbf·ft (16 N·m, 1.6 kgf·m)
Tighten the camshaft holder bolts in a criss-cross
pattern in 2 or 3 steps.
(10) camshaft holders
(11) camshaft holder bolts
(12) intake cam lobes
10. Insert the feeler gauge (16) between the intake
valve lifter and cam lobe.
If the feeler gauge cannot be inserted, the
shim is caught between the valve lifter and
the valve retainer. Remove the camshaft
holders, place the shim correctly, and reinstall
the camshaft holders.
Valve Clearances:
IN: 0.005 ± 0.001 in (0.12 ± 0.03 mm)
EX: 0.011 ± 0.001 in (0.28 ± 0.03 mm)
(16) feeler gauge
(11)
(11)
(10)
(12)
(16) (16)
7. Remove the stopper tool (13) from the cam
chain tensioner lifter.
(13)
(13) stopper tool
8. Install the new sealing washer (14) and cam
chain tensioner lifter cover bolt (15).
(14) sealing washer
(15) cam chain tensioner lifter cover bolt
(14)
(15)
(cont’d)
9. Rotate the camshaft by rotating the crankshaft
clockwise several times.
62 Servicing Your Honda
Valve Clearance
11.Install the spark plug (17) (page 54).
(17) spark plug
12.Coat a new O-ring (18) with grease and install
it onto the crankshaft hole cap (19).
Apply grease to the crankshaft hole cap
threads.
Install and tighten the crankshaft hole cap to
the specified torque:
11 lbf·ft (15 N·m, 1.5 kgf·m)
(18) O-ring
(19) crankshaft hole cap
Cylinder Head Cover Installation
1. Remove the spark plug hole packing (1) from
the cylinder head cover.
Install the spark plug hole packing to the
spark plug hole (2).
(1) spark plug hole packing
(2) spark plug hole
2. Install the cylinder head cover packing (3)
into the groove of the cylinder head cover (4).
(3) cylinder head cover packing
(4) cylinder head cover
3. Tighten the cylinder head cover (5) and
cylinder head cover bolts (6) to the specified
torque:
7 lbf·ft (10 N·m, 1.0 kgf·m)
(5) cylinder head cover
(6) cylinder head cover bolts
4. Connect the spark plug cap (7) and breather
tube (8).
(7) spark plug cap
(8) breather tube
5. Install the fuel tank and the seat (page 31).
(18)
(19)
(17)
(2)
(1)
(4)
(3)
(5)
(6)
(7)
(8)
Servicing Your Honda 63
Piston/Piston Rings/Piston Pin
Cylinder Head Removal
1. Clean the area above the engine before
disassembly to prevent dirt falling into the
engine.
2. Drain the engine oil (page 37).
3. Drain the radiator coolant after cooling the
motorcycle (page 42).
4. Remove the seat (page 29). and fuel tank
(page 30).
5. Remove the muffler and subframe (page 32).
6. Remove the carburetor (page 117).
7. Remove the exhaust pipe joint nuts (1),
exhaust pipe (2) and exhaust pipe gasket (3)
(page 88).
(1) exhaust pipe joint nuts
(2) exhaust pipe
(3) exhaust pipe gasket
8. Disconnect the spark plug cap (4).
9. Remove any dirt around the spark plug base.
(4) spark plug cap
(5) spark plug
11.Position the piston at top dead center on the
compression stroke (page 55).
Remove the cam shaft holders (page 57).
12.Loosen the radiator hose clamp (6) and
disconnect the radiator hose (7).
(6) radiator hose clamp
(7) radiator hose
(2)
(1)
(3)
(4)
(5)
(7)
(6)
(cont’d)
10. Remove the cylinder head cover (page 55).
Remove the spark plug (5).
64 Servicing Your Honda
Piston/Piston Rings/Piston Pin
13.Remove the engine hanger nuts (8) and engine
hanger plates (9).
(8) engine hanger nuts
(9) engine hanger plates
14.Remove the cylinder head bolts (10).
15.Loosen the cylinder bolt (11).
(10) cylinder head bolts
(11) cylinder bolt
Loosen the nuts in a criss-cross pattern in 2 or 3
steps.
Do not let the nuts, washers, valve lifters, shims,
and cam chain fall into the crankcase.
16.Remove the cylinder head nuts, washers (12)
and cylinder head (13).
NOTICE
(12) cylinder head nuts/washers
(13) cylinder head
17.Remove the dowel pins (14), cylinder head
gasket (15) and cam chain guide (16).
Do not let the dowel pins and cam chain fall into
the crankcase.
NOTICE
(14) dowel pins (16) cam chain guide
(15) cylinder head gasket
(8)
(9)
(10)
(11)
(13)
(12)
(14) (15)
(16)
Servicing Your Honda 65
Piston/Piston Rings/Piston Pin
Cylinder Removal
1. Remove the cylinder bolt (1) and cylinder (2).
Do not let the cam chain fall into the crankcase.
Do not pry on or strike the cylinder.
NOTICE
(1) cylinder bolt
(2) cylinder
2. Remove the dowel pins (3) and cylinder
gasket (4).
Do not let the dowel pins fall into the crankcase.
NOTICE
(3) dowel pins
(4) cylinder gasket
Piston Removal
1. Place clean shop towels in the crankcase to
keep the piston pin clips, or other parts, from
falling into the crankcase.
2. Remove the piston pin clips (1) using a pair of
needle-nose pliers.
3. Press the piston pin (2) out of the piston (3),
and remove the piston.
Do not damage the piston.
Always support the piston when pressing out the pin.
Do not let the clips fall into the crankcase.
Under racing conditions, the piston and rings
should be replaced after 15.0 hours of running.
Replace the piston pin after 30.0 hours of running.
NOTICE
(1) piston pin clip (3) piston
(2) piston pin (4) piston rings
4. Spread each piston rings (4) and remove by
lifting it up at a point just opposite the gap.
Do not damage the piston ring by spreading the
ends too far.
NOTICE
(2)
(1)
(4)
(3)
(3)
(2) (1)
(4)
66 Servicing Your Honda
Piston/Piston Rings/Piston Pin
Piston Ring Installation
1. Clean the piston ring groove
2. Apply engine oil to the piston rings and install
them.
Do not damage the piston ring by spreading the
ends too far.
Do not damage the piston during piston ring
installation.
• To install the oil ring, install the spacer first,
then install the side rails.
• Install the top ring on the piston with the
marking side facing up.
3. After installing the rings they should rotate
freely, without sticking.
Space the ring end gaps 180 degrees apart
between top ring and upper side rail.
Space the ring end gaps 90 degrees apart
between upper side rail, spacer and lower side
rail.
NOTICE
top ring
oil ring
mark
top ring
oil
ring
side rail
side rail
spacer
CamShaft Holders/Cylinder
Head/Cylinder/Piston/Piston Pin/Piston
Ring Inspection
We recommend you consult the Service Manual
or your authorized Honda dealer for correct
Service Limit measurements.
Servicing Your Honda 67
Piston/Piston Rings/Piston Pin
Piston Installation
1. Place clean shop towels in the crankcase to
keep the piston pin clips from falling into the
crankcase.
2. Apply molybdenum disulfide oil (a mixture of
1/2 engine oil and 1/2 molybdenum disulfide
grease (containing more than 3%
molybdenum disulfide additive)) to the
connecting rod small end.
3. Install the piston (1) with the “IN” mark (2)
and/or the large valve recesses (3) facing the
intake side of the engine.
4. Apply flesh engine oil to the piston pin (4).
Install the piston pin and new piston pin clips
(5).
Use new pin clips. Never reuse old clips.
Do not let the clips fall into the crankcase.
Do not align the piston pin clip end gap with the
piston cut-out.
NOTICE
(1) piston (4) piston pin
(2) “IN” mark (5) piston pin clip
(3) large valve recesses (6) cut-out
Cylinder Installation
1. Clean off any gasket material from the gasket
surface of the crankcase, being careful not to
let any material fall into the crankcase.
Be careful not to remove any metal from the
gasket surface.
2. Remove the shop towel. Do not let any gasket
debris fall into the crankcase.
3. Install the dowel pins (1) and cylinder gasket
(2).
Do not let the dowel pins fall into the crankcase.
NOTICE
(1) dowel pins
(2) cylinder gasket
4. Clean the any gasket material off the cylinder.
(1)
(3)
(2)
(1)
(4) (5)
(2)
(6)
(5)
(1)
(2)
(cont’d)
68 Servicing Your Honda
Piston/Piston Rings/Piston Pin
5. Apply clean engine oil to the cylinder wall,
piston outer surface and piston rings.
Route the cam chain (3) through the cylinder
(4).
Install the cylinder over the piston rings by
hand while compressing the piston rings (5).
Do not damage the piston rings and cylinder
walls.
NOTICE
(3) cam chain (4) cylinder
(5) piston rings
6. Install the cam chain guide (6) and fit the cam
chain guide tabs (7) in the cylinder cut-outs
(8).
Push the guide until it bottoms in the
crankcase guide hole.
(6) cam chain guide
(7) cam chain guide tabs
(8) cylinder cut-outs
Cylinder Head Installation
1. Install the dowel pins (1) and new cylinder
head gasket (2).
Do not let the dowel pins fall into the crankcase.
NOTICE
(1) dowel pins
(2) cylinder head gasket
(5)
(4)
(3)
(7)
(6)
(8)
(1)
(2)
Servicing Your Honda 69
Piston/Piston Rings/Piston Pin
2. Route the cam chain through the cylinder
head (3).
Install the cylinder head.
Do not damage mating surfaces when installing
the cylinder head.
3. Apply engine oil to all cylinder head nut
threads.
Install the washers and cylinder head nuts (4).
Tighten the cylinder head nuts to the specified
torque:
29 lbf·ft (39 N·m, 4.0 kgf·m)
Do not let the washers and nuts fall into the
crankcase.
Tighten the cylinder head nuts in a criss-cross
pattern in 2 or 3 steps.
NOTICE
NOTICE
4. Install the cylinder bolt (5) and cylinder head
bolts (6) and tighten them to the specified
torque:
7 lbf·ft (10 N·m, 1.0 kgf·m)
5. Install the engine hanger plates (7), engine
hanger nuts (8) of the frame side and engine
hanger nut (9) of the engine side.
Tighten the engine hanger nut to the specified
torque:
frame side:
25 lbf·ft (34 N·m, 3.5 kgf·m)
engine side: 40 lbf·ft (54 N·m, 5.5 kgf·m)
(3) cylinder head
(4) cylinder head nuts/washers
(5) cylinder bolt
(6) cylinder head bolts
(7) engine hanger plates
(8) engine hanger nuts of the frame side
(9) engine hanger nut of the engine side
(4)
(3)
(6)
(5)
(8)
(9)
(7)
(cont’d)
70 Servicing Your Honda
Piston/Piston Rings/Piston Pin
6. Connect the radiator hose (9) to the cylinder
head and tighten the radiator hose clamp (10)
securely.
(9) radiator hose
(10) radiator hose clamp
7. Install the shims and cam shaft (page 60).
8. Install the spark plug (11) (page 54).
(11) spark plug
9. Install the crankshaft hole cap (page 62).
(12) spark plug cap
11. Install a new exhaust pipe gasket (13),
exhaust pipe (14) and exhaust pipe joint nuts
(15) and tighten to the specified torque:
15 lbf·ft (21 N·m, 2.1 kgf·m)
(13) exhaust pipe gasket
(14) exhaust pipe
(15) exhaust pipe joint nuts
(9)
(10)
(11)
(12)
(13)
(14)
(15)
10. Install the cylinder head cover (page 62).
Connect the spark plug cap (12).
12. Install the carburetor (page 121) .
13. Install the subframe and muffler (page 32).
14. Install the fuel tank (page 31) and the seat
(page 29).
15. Pour a fresh recommended coolant mixture
(page 41) slowly into the radiator filler hole
up to the filler neck.
Capacity:
1.06 US qt (1.00R)
Lean your CRF slightly right and left several
times to bleed trapped air in the cooling
system.
If the coolant level lowers, add coolant and
repeat the above procedure.
Install the radiator cap (16) securely.
(16) radiator cap
Check for the following:
– compression leaks
– abnormal engine noise
– secondary air leaks
– coolant leaks
(16)
Servicing Your Honda 71
Suspension
Refer to Safety Precautions on page 19
Loose, worn, or damaged suspension components
may adversely affect the handling and stability of
your CRF. If any suspension components appear
worn or damaged, see your Honda dealer for
further inspection. Your dealer is qualified to
determine whether or not replacement parts or
repairs are needed.
Front Suspension Inspection
• When your CRF is new, break it in for
approximately one hour to ensure that the
suspension has worked in (page 15).
• After break-in, test run your CRF with the
front suspension at the standard setting before
attempting any adjustments.
• For optimum fork performance, we
recommend that you disassemble and clean
the fork after riding your CRF for 3 hours.
See page 95 for fork disassembly.
• Replace the fork oil every 3 races or 7.5 hours
of running. See page 73 for oil level
adjustment after changing the fork oil.
• Replace the damper fork oil every 9 races or
22.5 hours of running. See page 98 for
damper fork oil level adjustment after
changing the fork oil.
• Use Pro Honda HP Fork Oil 5W or an
equivalent which contains special additives to
assure maximum performance of your CRF's
front suspension.
• Periodically check and clean all front
suspension parts to assure top performance.
Check the dust seals for dust, dirt, and foreign
materials. Check the oil for any
contamination.
• Refer to
Suspension Adjustment Guidelines
(page 112). Make all rebound and
compression damping adjustments in one-click
increments. (Adjusting two or more clicks at
a time may cause you to pass over the best
adjustment.) Test ride after each adjustment.
• If you become confused about adjustment
settings, return to the standard position and
start over.
• If the fork is still too stiff/soft after adjusting
compression damping, determine which
portion of the travel is still too stiff/soft. This
is an important step that will help you solve
suspension problems.
1. Make sure that the fork protectors (1) and dust
seals (2) are clean and not packed with mud
and dirt.
2. Check for signs of oil leakage. Damaged or
leaking fork seals should be replaced before
your CRF is ridden.
(1) fork protector (2) dust seal
3. Inspect the wear rings (3) for wear or damage.
Replace the wear ring if it is 0.06 in (1.5 mm)
or flat with the outer tube (4).
Install the wear ring with its end gap facing
rearward.
(3) wear ring (4) outer tube
(3) wear rings
4. Make a quick check of fork operation by
locking the front brake and pushing down on
the handlebar several times.
(2)
(1)
(3)
(4)
(3)
(3)
72 Servicing Your Honda
Suspension
Rear Suspension Inspection
The swingarm is controlled by one hydraulic
shock absorber with an aluminum reservoir for
oil and nitrogen gas pressure. The gas pressure
in the reservoir is contained within a rubber
bladder.
The shock absorber’s spring preload and
damping adjustments (compression and rebound)
should be adjusted for the rider’s weight and
track conditions (page 111).
Do not attempt to disassemble, service, or
dis
pose of the damper; see your Honda dealer.
The instructions found in this owner’s manual are
limited to adjustments of the shock assembly only.
• When your CRF is new, break it in for
approximately one hour with the standard
suspension settings before attempting to
adjust the rear suspension.
• Make all compression and rebound damping
adjustments in the specified increment or
turns described in page 108. (Adjusting two or
more increments or turns at a time may cause
you to pass over the best adjustment.) Test
ride after each adjustment.
• If the rear suspension is too stiff/soft, adjust it
by turning all the compression and rebound
adjusters according to the procedures
described in page 108. After adjusting the
adjusters simultaneously, suspension may be
fine-tuned by turning one of the compression
and rebound damping adjusters in one click or
in 1/12 turn increments.
• If you have a problem finding an acceptable
adjustment, return to the standard position and
begin again.
1. Bounce the rear of the motorcycle up and down
and check for smooth suspension action.
2. Remove the subframe (page 32).
3. Check for a broken or collapsed spring.
4. Check the shock (1) for a bent shaft or oil
leaks.
(1) rear shock absorber
5. Push the rear wheel sideways to check for
worn or loose swingarm bearings. There
should be no movement. If there is, have the
bearings replaced by your authorized Honda
dealer.
(1)
Suspension
Servicing Your Honda 73
Recommended Fork Oil
Fork Oil Change
Refer to suspension removal on (page 95).
1. Record the rebound damping adjuster position
and turn the adjuster counterclockwise until it
stops.
2. Hold the outer tube (1), then remove the fork
damper (2) from the outer tube using a lock
nut wrench (3). Gently slide the outer tube
down onto the lower end of the slider (4).
viscosity (weight) 5 W
suggested oil
Pro Honda HP Fork Oil or
equivalent
(1) outer tube (3) lock nut wrench
(2) fork damper (4) slider, lower end
The outer tube can drop on the slider and
damage the fork dust seal and guide bushing
when the fork damper is removed. To avoid
damage, hold both the outer tube and slider
when removing the fork damper.
NOTICE
(1) outer tube (6) guide bushing
(5) dust seal (7) slider
3. Pour the fork oil from the outer tube (1).
Pour the fork oil from the oil hole (9) of the
fork damper.
(1) outer tube (9) oil hole
4. Drain the fork oil by turning the outer tube (1)
upside down. (About 12 cc of fork oil will be
left in the outer tube when it is left inverted
for about 20 minutes at 20 °C/68°F.)
(1) outer tube
Amount of fork oil left in the fork
(within damper and spring) unit: cc
minute
°C/°F
30/86
20/68
10/50
0/32
5
27
29.4
28.2
30.6
10
15.3
16.5
21.2
22.4
20
10.6
11.8
16.5
18.8
35
9.4
10.6
15.3
16.5
55
8.3
9.4
12.9
16.5
85
7.9
8.2
11.8
15.3
145
7.9
8.2
11.8
14.1
(3)
(2)
(1)
(1)
(4)
(5)
(6)
(7) (1)
(1)
(9)
(1)
(cont’d)
74 Servicing Your Honda
Suspension
5. Pour the recommended fork oil into the outer
tube (1).
Fork Oil Capacity:
Standard (0.45 kgf/mm) Fork Spring
or
Standard oil
capacity
12.5 US oz
(371 cm
3
)
Maximum oil
capacity
14.1 US oz
(417 cm
3
)
Slightly stiffer as
it nears full
compression.
Slightly stiffer as
it nears full
compression.
Minimum oil
capacity
10.9 US oz
(321 cm
3
)
Optional Softer (0.43 kgf/mm) Fork Spring
Standard oil
capacity
12.4 US oz
(368 cm
3
)
Maximum oil
capacity
14.0 US oz
(414 cm
3
)
Slightly stiffer as
it nears full
compression.
Slightly stiffer as
it nears full
compression.
Minimum oil
capacity
10.8 US oz
(318 cm
3
)
1 scribe mark
(aftermarket parts)
No mark
(factory products)
3 scribe mark
Optional Stiffer (0.47 kgf/mm) Fork Spring
Standard oil
capacity
12.6 US oz
(374 cm
3
)
Maximum oil
capacity
14.2 US oz
(420 cm
3
)
Slightly stiffer as
it nears full
compression.
Slightly stiffer as
it nears full
compression.
Minimum oil
capacity
11.0 US oz
(324 cm
3
)
1 scribe mark and
3 scribe mark 75 degrees apart
(1)
Be sure the oil capacity is the same in both fork
legs.
(1) outer tube
Suspension
Servicing Your Honda 75
6. Check that the O-ring (10) on the fork damper
(2) is in good condition. Apply the
recommended fork oil to the O-ring.
(2) fork damper
(10) o-ring
7. Tighten the fork damper using the special
tool, to the specified torque:
25 lb·ft (34 N·m, 3.5 kgf·m)
(10)
(2)
76 Servicing Your Honda
Brakes
Refer to Safety Precautions on page 19.
Both the front and rear brakes are the hydraulic
disc type. As the brake pads wear, the brake
fluid level will drop. A leak in the system will
also cause the level to drop.
Frequently inspect the system to ensure there are
no fluid leaks. Periodically inspect the brake
fluid level and the brake pads for wear.
If the front brake lever or rear brake pedal
freeplay does not feel within the normal range
while riding, check the brake pads. If they are
not worn beyond the recommended limit (page
79), there is probably air in the brake system.
Refer to the Honda Service Manual or see your
Honda dealer to have the air bled from the
system.
Front Brake Lever Adjustment
(1) lock nut (3) piston
(2) adjuster
1. Loosen the lock nut (1).
2. To position the brake lever farther away from
the handgrip, turn the adjuster (2) clockwise.
To position the brake lever closer to the
handgrip, turn the adjuster counterclockwise.
3. Tighten the lock nut.
4. Apply the brake, release it, then spin the
wheel and check that it rotates freely. Repeat
this procedure several times.
5. Check freeplay by pulling in slowly on the
front brake lever until the brake starts to
engage.
Freeplay
: 0.8 in (20 mm)
6. Apply grease to the contacting faces of the
adjuster and piston (3).
Brake Pedal Height
The brake pedal height should be approximately
level with the right footpeg.
1. Loosen the lock nut (1) and turn the adjusting
bolt (2) in direction (+) to raise the pedal (3)
or in direction (–) to lower it.
2. Tighten the lock nut at the desired pedal
height.
(1) lock nut (+) raise the pedal height
(2) adjusting bolt (–) lower the pedal height
(3) rear brake pedal
(1)
(2)
(3)
(3)
(–)
(+)
(1)
(2)
Servicing Your Honda 77
Brakes
Fluid Level Inspection
Front Brake Fluid Level Check
(1) LOWER level mark
With the motorcycle in an upright position, check
the fluid level.
It should be above the LOWER level mark (1). If
the level is at or below the LOWER level mark,
check the brake pads for wear (page 79).
Worn brake pads should be replaced. If the pads
are not worn, have your brake system inspected
for leaks.
If the brake lever freeplay exceeds 0.8 in
(20 mm), there is probably air in the brake
system and it must be bled. Refer to the Honda
Service Manual or see your Honda motorcycle
dealer for brake bleeding.
Rear Brake Fluid Level Check
(2) LOWER level mark
With the motorcycle in an upright position, check
the fluid level.
It should be above the LOWER level mark (2). If
the level is at or below the LOWER level mark,
check the brake pads for wear (page 79).
Worn brake pads should be replaced. If the pads
are not worn, have your brake system inspected
for leaks.
If the brake pedal freeplay exceeds 0.8 in
(20 mm), there is probably air in the brake
system and it must be bled. Refer to the Honda
Service Manual or see your Honda motorcycle
dealer for brake bleeding.
(1)
(2)
(cont’d)
78 Servicing Your Honda
Brakes
Adding Front Brake Fluid
The recommended brake fluid is Honda DOT 4
brake fluid or an equivalent.
When adding brake fluid be sure the reservoir is
horizontal before the cap is removed or brake
fluid may spill out.
(1) screws
(2) reservoir cap/diaphragm
(3) upper level mark
1. Remove the screws (1), reservoir cap (2) and
diaphragm.
2. Fill the reservoir with DOT 4 brake fluid to
the upper level mark (3). Do not overfill.
3. Reinstall the diaphragm and reservoir cap.
4. Tighten the screws securely to the specified
torque:
1.1 lbf·ft (1.5 N·m, 0.15 kgf·m)
Adding Rear Brake Fluid
The recommended brake fluid is Honda DOT 4
brake fluid or an equivalent.
When adding brake fluid be sure the reservoir is
horizontal before the cap is removed or brake
fluid may spill out.
(4) bolts
(5) reservoir cap/diaphragm
(6) upper level mark
1. Remove the bolts (4) reservoir cap and
diaphragm (5).
2. Fill the reservoir with DOT 4 brake fluid to
the upper level mark (6). Do not overfill.
3. Reinstall the diaphragm and reservoir cap.
4. Tighten the bolts to the specified torque:
1.1 lbf·ft (1.5 N·m, 0.15 kgf·m)
Other Inspection
• Make sure there are not fluid leaks.
• Check for deterioration or cracks in the hoses
and fittings.
(1)
(2)
(3)
(4)
(5)
(6)
Servicing Your Honda 79
Brakes
Brake Pad Wear
Brake pad wear depends on the severity of usage
and track conditions. (Generally, the pads will
wear faster on wet and dirty tracks) Inspect the
pads at each regular maintenance interval (page
21).
Front Brake Pads
Inspect the brake pads (2) through the front
wheel to determine the pad wear. If either pad is
worn anywhere to a thickness of 0.04 in (1 mm),
both pads must be replaced.
(1) brake caliper (3) brake disc
(2) brake pads
Rear Brake Pads
Inspect the brake pads (5) from the rear side of
the caliper to determine the pad wear. If either
pad is worn anywhere to a thickness of 0.04 in
(1 mm), both pads must be replaced.
(4) rear brake caliper (6) brake disc
(5) brake pads
Other Inspections
Check that the front lever and rear pedal
assemblies are positioned properly and the
securing bolts are tight.
Make sure there are no fluid leaks. Check for
deterioration or cracks in the hoses and fittings.
minimum thickness
indicator
wear indicator
grooves
replace
replace
0.04 in
(1 mm)
0.04 in
(1 mm)
(1) (3)
(2)
(2)
replace
0.04 in
(1 mm)
minimum thickness
indicator
(5)
(6)
(4)
(5)
80 Servicing Your Honda
Wheels
Refer to Safety Precautions on page 19.
Maintenance of spoke tension and wheel trueness
(roundness) is critical to safe motorcycle
operation. During the first 100 miles (150 km),
spokes will loosen more rapidly due to the initial
seating of the parts. Excessively loose spokes
may result in instability at high speeds and the
possible loss of control. It’s also important that
the rim locks are secure to prevent tire slippage.
It is not necessary to remove the wheels to
perform the recommended service in the
Maintenance Schedule (page 21). However,
information for wheel removal is provided for
emergency situations.
Wheel Rims & Spokes
(1) wheel rim (3) rim lock
(2) spoke
1. Inspect the wheel rims (1) and spokes (2) for
damage.
2. Tighten, any loose spokes and rim locks (3) to
the specified torque:
Front Spoke
:
2.7 lbf·ft (3.68 N·m, 0.38 kgf·m)
Rear Spoke :
2.7 lbf·ft (3.7 N·m, 0.38 kgf·m)
Rim Lock : 9.4 lbf·ft (13 N·m, 1.3 kgf·m)
3. Check wheel rim runout. If runout is
noticeable, see the Honda Service Manual for
inspection instructions.
Axles & Wheel Bearings
See the Honda Service Manual for inspection
information:
1. Check the axle shaft for runout.
2. Check the condition of the wheel bearings.
(1)
(3)
(2)
Servicing Your Honda 81
Tires & Tubes
WARNING
Using tires that are excessively worn or
improperly inflated can cause a crash in
which you can be seriously hurt or killed.
Follow all instructions in this owner’s
manual regarding tire inflation and
maintenance.
Front 15 psi (100 kPa, 1.0 kgf/cm
2
)
Rear 15 psi (100 kPa, 1.0 kgf/cm
2
)
Refer to Safety Precautions on page 19.
To safely operate your CRF the tires must be the
proper type (off-road) and size, in good condition
with adequate tread, and correctly inflated.
The following pages give detailed information on
how and when to check your air pressure, how to
inspect your tires for wear and damage, and our
recommendations on tire repair and replacement.
Air Pressure
Properly inflated tires provide the best
combination of handling, tread life, and riding
comfort. Generally, underinflated tires wear
unevenly, adversely affect handling, and are more
likely to fail from being overheated.
Underinflated tires can also cause wheel damage
on hard terrain. Overinflated tires make your
motorcycle ride more harshly, are more prone to
damage from surface hazards, and wear
unevenly.
Make sure the valve stem caps are secure. If
necessary, install a new cap.
Always check air pressure when your tires are
“cold.” If you check air pressure when your tires
are “warm” — even if your CRF has only been
ridden for a few miles — the readings will be
higher. If you let air out of warm tires to match
the recommended cold pressures, the tires will be
underinflated.
The correct “cold” tire pressures are:
If you decide to adjust tire pressures for a
particular riding condition, make changes a little
at a time.
Inspection
Take time to inspect your tires and wheels before
you ride.
• Inspect carefully for bumps or bulges in the
side of the tire or the tread. Replace any tire
that has a bump or bulge.
• Look closely for cuts, slits, or cracks in the
tires. Replace a tire if you can see fabric or
cord.
• Check for rocks or other objects embedded in
the tire or tread. Remove any objects.
• Measure tread depth (1). Replace the tire
before depth at the center reaches 0.12 in (3
mm), or any time you notice a reduction in
traction.
• Check the position of both valve stems. A
tilted valve stem indicates the tube is slipping
inside the tire or the tire is slipping on the
rim.
Tube Replacement
If a tube is punctured or damaged, you should
replace it as soon as possible. A repaired tube
may not have the same reliability as a new one,
and it may fail while you are riding.
Use a replacement tube equivalent to the original.
(1)
(1) tire tread depth
82 Servicing Your Honda
Tires & Tubes
Tire Replacement
The tires that came on your CRF were designed
to provide a good combination of
handling, braking, durability, and comfort across
a broad range of riding conditions.
WARNING
Installing improper tires on your
motorcycle can affect handling and
stability. This can cause a crash in which
you can be seriously hurt or killed.
Always use the size and type of tires
recommended in this owner’s manual.
Front 80/100-21 51M
Rear 100/90-19 57M
Type bias-ply, tube
• Use a replacement tire equivalent to the
original.
• Replace the tube any time you replace a tire.
The old tube will probably be stretched and, if
installed in a new tire, could fail.
Servicing Your Honda 83
Drive Chain
Refer to Safety Precautions on page 19.
The service life of the chain depends on proper
lubrication and adjustment. Poor maintenance
can cause premature wear or damage to the drive
chain or sprockets.
When the motorcycle is ridden on unusually
dusty or muddy tracks, more frequent
maintenance will be necessary.
Before servicing your drive chain, turn the
engine OFF, raise the rear wheel off the ground
by placing the optional workstand or equivalent
support under the engine and check that your
transmission is in neutral.
It is not necessary to remove or replace the drive
chain to perform the recommended service in the
Maintenance Schedule.
Drive Chain Inspection
1. Turn the engine off, raise the rear wheel off
the ground by placing the optional workstand
or equivalent support under the engine and
shift the transmission into neutral.
2. Check slack (1) in the upper drive chain run
midway between the sprockets (2)(3). Drive
chain slack should allow the following
vertical movement by hand:
1 – 1 3/8 in (25 – 35 mm)
(1) drive chain slack (3) driven sprocket
(2) drive sprocket
3. Check drive chain slack at several points
along the chain. The slack should remain
constant. If it isn’t, some links may be kinked
and binding. Lubricating the chain will often
eliminate binding and kinking.
Excessive chain slack may allow the drive chain
to damage the engine cases.
4. Inspect the drive chain for:
• damaged rollers
• loose pins
• dry or rusted links
• kinked or binding links
• excessive wear
Replace the drive chain (page 85) if it has
damaged rollers, loose pins, or kinks that cannot
be freed. Lubricate the drive chain (page 84) if it
appears dry or shows signs of rust. Lubricate
any kinked or binding links and work them free.
Adjust chain slack if needed.
NOTICE
(4) chain slider
6. Check the chain guide slider (5) for wear.
Replace the chain guide slider if it is worn to
the bottom of the wear limit groove (6).
(5) chain guide slider
(6) wear limit groove
(cont’d)
(2)
(1)
(3)
(4)
(5)
(6)
5. Check the chain slider (4) for wear.
If the wear is 3/16 in (5 mm) or more, replace
it.
84 Servicing Your Honda
(6) upper drive chain roller
(7) lower drive chain roller
If the upper drive chain roller was removed,
install the drive chain roller with its “” mark
(8) side facing out.
Install the lower drive chain roller.
Drive Chain
(6) upper drive chain roller (8) “” mark
(7) lower drive chain roller
8. Check the driven sprocket nut torque values
after each race.
24 lbf·ft (32 N·m, 3.3 kgf·m)
(1) rear axle nut (4) index mark
(2) lock nut (5) axle plate
(3) adjusting bolt (6) reference mark
3. Tighten the rear axle nut to the specified
torque:
94 lbf·ft (128 N·m, 13.0 kgf·m)
4. Recheck chain stack and adjust as necessary.
5. Loosen the adjusting bolt counterclockwise
lightly until it touches the axle plate. Then,
while holding the adjusting bolt with a
wrench, tighten the lock nut to the specified
torque:
20 lbf·ft (27 N·m, 2.8 kgf·m)
(6)
(7)
(8)
(7)
(6)
(6)
(1)
(2)
(3)
(5)
(4)
Lubrication
Commercially prepared drive chain lubricants
may be purchased at most motorcycle shops and
should be used in preference to motor oil. Pro
Honda Chain Lube or an equivalent, or SAE 80
or 90 gear oil is recommended.
Saturate each chain joint so that the lubricant
penetrates the space between adjacent surfaces of
the link plates and rollers.
Adjustment
1. Loosen the rear axle nut (1).
2. Loosen both the lock nuts (2) and turn the
adjusting bolts (3) counterclockwise to
decrease slack or clockwise to increase slack.
Align the index marks (4) of the axle plates
(5) with the same reference marks (6) on both
sides of the swingarm.
7. Check the upper drive chain roller (6) and
lower drive chain roller (7) for wear or
damage.
Replace if necessary.
Upper Roller: 1.5 in (39 mm)
Lower Roller: 1.2 in (31 mm)
Servicing Your Honda 85
Drive Chain
4. Inspect the sprocket teeth for wear or damage.
We recommend replacing the sprocket
whenever a new chain is installed.
Both chain and sprockets must be in good
condition, or the new replacement chain or
sprocket(s) will wear rapidly.
Excessively worn sprocket teeth have a
hooked, worn appearance. Replace any
sprocket which is damaged or excessively
worn.
Use of a new chain with worn sprockets will
cause rapid chain wear.
5. Measure a section of the drive chain to
determine whether the chain is worn beyond
its service limit. Put the transmission in gear,
and then turn the rear wheel forward until the
lower section of the chain is pulled taut. With
the chain held taut and any kinked joints
straightened, measure the distance between a
span of 17 pins, from pin center to pin center.
If the measurement exceeds the service limit,
replace the chain. After the chain is
measured, shift the transmission into neutral
again before proceeding with inspection and
service.
NOTICE
MEASURE A SPAN OF 17 PINS (16 PITCHES)
6. Lubricate the drive chain.
7. Pass the chain over the sprockets and join the
ends of the chain with the master link. For
ease of assembly, hold the chain ends against
adjacent rear sprocket teeth while inserting
the master link. Install the master link
retaining clip so that the closed end of the clip
will face the direction of forward wheel
rotation.
8. Recheck chain slack and adjust as necessary.
More About Drive Chain
• The master link is the most critical element of
drive chain security. Master links are
reusable, as long as they remain in excellent
condition. We recommend installing a new
master link retaining clip when the drive
chain is reassembled.
• You may find it easier to install a new chain
by connecting it to the old chain with a
master link and pulling the old chain to
position the new chain on the sprockets.
Removal, Cleaning & Replacement
For maximum service life, the drive chain should
be cleaned, lubricated, and adjusted before each
outing.
1. Remove the master link retaining clip (1) with
pliers. Do not bend or twist the clip.
Remove the master link (2). Remove the
drive chain.
(1) retaining clip (2) master link
2. Clean the drive chain in high flash-point
solvent and allow it to dry.
3. Inspect the drive chain for possible wear or
damage. Replace the drive chain if it has
damaged rollers, loose fitting links, or
otherwise appears unserviceable.
Replacement chain:
D.I.D.520DMA2
(1)
(2)
Service limit: 10.20 in (259.0 mm)
86 Servicing Your Honda
Exhaust Pipe/Muffler
Exhaust Pipe/Muffler Inspection
1. Check the flange bolts for tightness.
2. Check the exhaust pipe and muffler for cracks
or deformation.
A damaged exhaust pipe and muffler may
reduce engine performance.
Muffler Removal
1. Remove the seat bolt (1), collars (2), side
cover bolt (3) and right side cover (4).
(1) seat bolt (3) side cover bolt
(2) collars (4) right side cover
2. Loosen the muffler clamp bolt (5).
3. Remove the muffler A bolt (6), muffler B
bolt/washer (7) and muffler (8).
(5) muffler clamp bolt (7) muffler B bolt/washer
(6) muffler A bolt (8) muffler
(2)
(1)
(4)
(3)
(2)
(7)
(8)
(6)
(5)
Servicing Your Honda 87
Exhaust Pipe/Muffler
Muffler Installation
1. Install the muffler clamp (1) by aligning the
tab (2) of the muffler clamp with the cut-out
(3) of the muffler (4).
(1) muffler clamp (3) cut-out
(2) tab (4) muffler
2. Remove the old gasket.
3. Install the new gasket (5).
(5) gasket
4. Install the muffler.
5. Tighten the muffler A bolt (6) and muffler B
bolt/washer (7) to the specified torque:
19 lbf·ft (26 N·m, 2.7 kgf·m)
6. Tighten the muffler clamp bolt (8) to the
specified torque:
15 lbf·ft (21 N·m, 2.1 kgf·m)
(4) muffler (7) muffler B bolt/washer
(6) muffler A bolt (8) muffler clamp bolt
(9) right side cover (11) side cover bolt
(10) collars (12) seat bolt
(3)
(4)
(1)
(2)
(5)
(4)
(6)
(8)
(7)
(10)
(12)
(9)
(11)
(10)
7. Install the right side cover (9), collar (10) and
side cover bolt (11).
8. Install the collar (10) and seat bolt (12) and
tighten the bolt to the specified torque:
19 lbf·ft (26 N·m, 2.7 kgf·m)
88 Servicing Your Honda
Exhaust Pipe/Muffler
Exhaust Pipe Installation
1. Install a new exhaust pipe gasket (1), exhaust
pipe (2) and exhaust pipe joint nuts (3) and
tighten to the specified torque:
15 lbf·ft (21 N·m, 2.1 kgf·m)
(1) exhaust pipe gasket
(2) exhaust pipe
(3) exhaust pipe joint nuts
2. Install the muffler (page 87).
Exhaust Pipe Removal
1. Remove the muffler (page 86).
2. Remove the exhaust pipe joint nuts (1),
exhaust pipe (2) and exhaust pipe gasket (3).
(1) exhaust pipe joint nuts
(2) exhaust pipe
(3) exhaust pipe gasket
(2)
(1)
(3)
(1)
(2)
(3)
Servicing Your Honda 89
Additional Maintenance Procedures
Refer to Safety Precautions on page 19.
Steering Head Bearings Inspection
1. With your CRF on a box or workstand (front
wheel elevated), turn the handlebar to the
right and left to check for roughness in the
steering head bearings.
2. Stand in front of your CRF, grab the fork (at
the axle), look at the steering head, and push
the fork in and out (toward the engine) to
check for play in the steering head bearings.
If any roughness or play is felt, but you do
not see any movement in the steering head,
the fork bushings may be worn. Refer to the
Honda Service Manual for replacement or
adjustment procedures, or see your Honda
dealer.
Handlebar Inspection
1. Remove the handlebar pad.
2. Check the handlebar (1) for bends or cracks.
3. Check that the handlebar has not moved from
its proper position (by inspecting the punch
mark).
4. Tighten the front bolts first.
5. Check the torque of the upper holder (2) bolts:
16 lbf·ft (22 N·m, 2.2 kgf·m)
(1) handlebar (2) handlebar upper holders
Control Cables
Periodically, disconnect the throttle, clutch and
hot start cables at their upper ends. Thoroughly
lubricate the cable pivot points with a
commercially-available cable lubricant. Be
certain that the throttle cables have no kinks or
other damage.
(2)
(1)
90 Servicing Your Honda
Additional Maintenance Procedures
Nuts, Bolts, Fasteners
Check and tighten nuts, bolts, and fasteners
before every outing.
Item
1
2
3
4
5
6
7
8
9
10
ENGINE
Cylinder head cover
Exhaust pipe joint nut
Water pump cover
Crankshaft hole cap
Transmission oil check
bolt
Clutch cover
Cylinder bolt
Oil filter cover
Cylinder head bolt
Drive sprocket
Torque
lbf
•
ft N
•
m kgf
•
m
7
15
7
11
7
7
7
9
7
23
10
21
10
15
10
10
10
12
10
31
1.0
2.1
1.0
1.5
1.0
1.0
1.0
1.2
1.0
3.2
(1) cylinder head cover
(2) exhaust pipe joint nuts
(3) water pump cover
(4) crankshaft hole cap
(5) transmission oil check bolt
(6) clutch cover
(7) cylinder bolts
(8) oil filter cover
(9) cylinder head bolt
(10) drive sproket
(6)
(1)
(2)
(3)
(5)
(4)
(9)
(7)
(8)
(10)
RIGHT SIDE
LEFT SIDE
Servicing Your Honda 91
Appearance Care
Refer to Safety Precautions on page 19.
Frequent cleaning and polishing will keep your
Honda looking newer longer. Frequent cleaning
also identifies you as an owner who values his
motorcycle. A clean CRF is also easier to inspect
and service.
While you’re cleaning, be sure to look for
damage, wear, and gasoline or oil leaks.
General Recommendations
• To clean your CRF you may use:
– water
– a mild, neutral detergent and water
– a mild spray and wipe cleaner/polisher
– a mild spray and rinse cleaner/degreaser and
water
• Avoid products that contain harsh detergents
or chemical solvents that could damage the
metal, paint, and plastic on your CRF or
discolor the seat and decals.
• If your CRF is still warm from recent
operation, give the engine and exhaust system
time to cool off.
• We recommend the use of a garden hose to
wash your CRF. High pressure washers, (like
those at coin-operated car washes) can
damage certain parts of your CRF. The force
of water under extreme pressure can penetrate
the dust seals of the suspension pivot points
and steering head bearings-driving dirt inside
and needed lubrication out.
If you use a high pressure washer, avoid spraying
the following areas:
wheel hubs
muffler outlet
under seat
engine stop button
brake master cylinders
under fuel tank
drive chain
carburetor
steering head bearings
suspension pivot points
(1) steering head bearings
(2) suspension pivot points
High pressure water (or air) can damage
certain parts of your CRF.
You may use Pro Honda Hondabrite, a
multi-surface cleaner/degreaser, to remove both
dirt and petroleum-based grime from paint, alloy,
plastic, and rubber surfaces. Wet any heavy
deposits with water first. Then spray on the
Hondabrite and rinse with a garden hose at full
pressure. Stubborn deposits may require a quick
wipe with a sponge.
NOTICE
Washing Your Motorcycle with a Mild
Detergent
1. Rinse your CRF thoroughly with cool water to
remove loose dirt.
2. Fill a bucket with cool water. Mix in a mild,
neutral detergent, such as dish washing
liquid or a product made especially for
washing motorcycles or automobiles.
3. Wash your CRF with a sponge or a
soft towel. As you wash, check for heavy
grime. If necessary, use a mild
cleaner/degreaser to remove the grime.
Do not use steel wool to clean the frame as it
could damage or discolor the frame surface.
Muffler stain remover is for removing stains on
the non-coated aluminum frame only.
4. After washing, rinse your CRF thoroughly
with plenty of clean water to remove any
residue.
5. Dry your CRF with a chamois or a
soft towel.
6. Lubricate the drive chain to prevent rusting.
7. Start the engine and let it idle for several
minutes. The engine heat will help dry moist
areas.
8. As a precaution, ride at a slow speed and
apply the brakes several times. This will help
dry the brakes and restore normal braking
performance.
(2)
(1)
92 Servicing Your Honda
Appearance Care
Condensation Control
Some condensation can form within the
transmission cavity as well. This is natural and
just one more reason you should change the
engine and transmission oil often.
After Cleaning Lubrication
There are some things you should do just after
washing your CRF to help prevent rust and
corrosion.
Once your CRF is clean and dry, you should
protect any bare steel from rusting by applying a
light coating of a rust-inhibitor. Lubricate the
drive chain and drive sprocket after removing
and thoroughly cleaning in solvent. Be sure the
chain is wiped clean and is dry before applying
the chain lube.
Follow the suggestions given in the pages of this
manual for lubricating items such as the brake
and clutch lever pivot points and footpeg pivot
pins.
Aluminum Frame Maintenance
Aluminum corrodes when it comes in contact
with dust, mud and road salt.
To remove stains, use Scotch Brite Hand Pad
#7447 (maroon) or an equivalent.
Wet the pad and polish the surface using strokes
parallel to the length of the frame.
Clean the frame using a wet sponge and a mild
detergent, then rinse well with clean water. Dry
the frame with a soft clean cloth, using strokes
parallel to the length of the frame.
Do not use steel wool to clean the frame as it
could damage or discolor the frame surface.
Muffler stain remover (Scotch Brite Hand Pad
#7447-maroon) is for removing stains on the
non-coated aluminum frame only.
NOTICE
Exhaust Pipe Maintenance
The exhaust pipe is stainless steel, but may
became stained by oil or mud.
Remove heat stains with a liquid kitchen
abrasive.
This section tells you how to fine tune your CRF
for maximum competition performance.
Initial suspension adjustments should be
performed after a minimum of two hours of easy
break-in time.
Optional front and rear suspension springs are
available in both firmer and softer than standard
rates, in order to tailor your CRF specifically for
your weight, riding style and course conditions.
Follow the instructions given in the rear
suspension sag setting section of Rear
Suspension Adjustments to determine if your
combined rider and sprung machine weight (rider
fully dressed for competition and machine
coolant, oil and fuel levels ready for competition)
requires an optional firmer or softer rear spring.
The need for either optional rear spring may need
to be balanced by installing the optional fork
springs of a similar rate.
Front Suspension Adjustments...........................94
Rear Suspension Adjustments..........................107
Suspension Adjustments for Track
Conditions ...................................................111
Suspension Adjustment Guidelines..................112
Carburetor Adjustments & Tuning Tips...........115
Chassis Adjustments.........................................127
Gearing .............................................................128
Tire Selection for Track Conditions.................129
Personal Fit Adjustments .................................130
Adjustments for Competition 93
Adjustments for Competition
94 Adjustments for Competition
Front Suspension Adjustments
The front suspension can be adjusted for the
rider’s weight and riding conditions by using one
or more of the following methods:
• Oil volume — The effects of higher or lower
fork oil level are only felt during the final 3.9
in (100 mm) of fork travel.
• Compression damping — Turning the
compression damping screw adjusts how
quickly the fork compresses.
• Rebound damping — Turning the rebound
damping screw adjusts how quickly the fork
extends.
• Fork springs — Optional springs are
available in softer and stiffer types than the
standard rate. (page 147)
The inverted fork on your CRF features sealed
damper cartridges with dual (separate air and oil)
chambers to prevent aeration. The design also
isolates the oil in each fork tube/slider, which
may contain air bubbles and/or metal particles,
from the sealed cartridge to provide more
consistent damping.
(1) compression damping adjuster
(2) rebound damping adjuster
(1)
(2)
Front Suspension Air Pressure
Air is an unstable gas which builds up pressure
as it is worked (such as in a fork). Air pressure
acts as a progressive spring and affects the entire
range of fork travel. This means the fork action
on your CRF will get stiffer during a race. For
this reason, release built-up air pressure in the
fork legs between motos. Be sure the fork is
fully extended with the front tire off the ground
when you release the pressure.
The standard air pressure is 0 psi (0 kPa, 0
kgf/cm
2
). You may relieve accumulated air
pressure in the fork legs by using the pressure
release screws. The front wheel should be off the
ground before you release the pressure.The air
pressure should be adjusted according to the
altitude and outside temperature.
1. Place an optional workstand under the engine,
so that the front wheel is off the ground.
Do not adjust air pressure with the front wheel
on the ground as this will give false pressure
readings.
2. Remove the pressure release screw (1).
3. Check that the O-ring (2) is in good condition.
4. Install the pressure release screw to the
specified torque:
0.9 lbf·ft (1.2 N·m, 0.12 kgf·m)
(1) pressure release screws (2) O-ring
(2)
(1)
Front Suspension Damping
Rebound Damping
Adjustment
The fork rebound damping adjuster screw (1) has
16 positions or more. Turning the adjuster screw
one full turn clockwise advances the adjuster four
positions. To adjust the rebound damping to the
standard setting, proceed as follows:
Turn the adjuster clockwise until it will no longer
turn (lightly seats). This is the full hard position.
The adjuster is set in the standard position when
the adjuster is turned counterclockwise 8 clicks.
Make sure that both fork legs are adjusted to the
same position.
Compression Damping
Adjustment
This adjustment affects how quickly the fork
compresses. The fork compression damping
adjuster screw (2) has 16 positions or more.
Turning the adjuster screw one full turn changes
the adjuster four positions. To adjust the adjuster
to the standard position, proceed as follows:
Turn the adjuster clockwise until it will no longer
turn (lightly seats). This is the full hard position.
The adjuster is set in the standard position when
the adjuster is turned counterclockwise 10 clicks.
Make sure that both fork legs are adjusted to the
same position.
Adjustments for Competition 95
Front Suspension Adjustments
Both compression and rebound damping can be
increased by turning the adjuster clockwise.
Always start with full hard when adjusting
damping.
Do not turn the adjuster screw more than the
given positions or the adjuster may be damaged.
Be sure that the rebound and compression
adjusters are firmly located in a detent, and not
between positions.
NOTICE
Front Suspension Disassembly
• If your CRF is brand-new, put enough part-
throttle break-in time (about one hour) on it to
ensure that the suspension has worked in.
• For optimum performance, and extended fork
life, the fork should be completely
disassembled and cleaned after the first three
hours of riding. See the Service Manual or
your authorized Honda dealer for this service.
1. Place your CRF on the optional workstand or
equivalent support with the front wheel off the
ground.
2. Remove the number plate bolt (1) and number
plate (2).
Fork Springs
The fork springs in CRF’s are about right for
riders weighing between 150 and 160 lbs (less
riding gear). So if you're a heavier rider, you
have to go up on the oil level or get a stiffer
spring. Do not use less oil than the minimum
specified for each spring or there will be a loss of
rebound damping control near full extension. If
the fork is too hard on big bumps, turn the
damping adjuster counterclockwise 1-turn and
lower the oil level in increments of 0.2 oz (5 cc)
in both fork legs until the desired performance is
obtained. Do not, however, lower the oil level
below the minimum oil level.
Minimum oil capacity:
Standard spring: 10.9 US oz (321 cm
3
)
Softer spring: 10.8 US oz (318 cm
3
)
Stiffer spring: 11.0 US oz (324 cm
3
)
When adjusting oil levels, bear in mind that the
air in the fork will increase in pressure while
riding; therefore, the higher the oil level, the
higher the eventual pressure of any air in the
fork.
(1) rebound damping (2) compression
adjuster screw damping
adjuster screw
(1)
(2)
Force (N)
Stroke (mm)
Oil capacity 14.1 US oz (417 cm
3
)
(MAX)
Oil capacity 12.5 US oz (371 cm
3
)
(STANDARD)
Oil capacity 10.9 US oz (321 cm
3
)
(MIN)
(2)
(1)
(1) number plate bolt
(2) number plate
(cont’d)
Front Suspension Adjustments
96 Adjustments for Competition
3. Remove the handlebar pad.
Remove the washers/handlebar holder nuts (3),
mounting rubbers and handlebar (4).
Keep the master cylinder upright to prevent air
from entering system.
NOTICE
(4)
(3)
(3) washers/houndlebar holder nuts
(4) handlebar
4. Loosen the upper pinch bolts (5).
5. Loosen the fork damper (6), but do not
remove them yet.
Do not use an adjustable wrench to loosen the
fork damper: it may damage them.
Loosen the upper pinch bolts before loosening
the fork damper to avoid damaging the fork cap.
NOTICE
(5) upper pinch bolts (6) fork damper
6. Remove the disc cover (7) by removing the
disc cover bolts (8).
(7) disc cover (8) disc cover bolts
7. Remove the front axle nut (9) and loosen the
front axle pinch bolts (10) on both forks.
Pull the front axle shaft (11) out of the wheel
hub and remove the front wheel.
(9) axle nut (11) front axle shaft
(10) axle pinch bolts
8. Remove the fork protector (12) and brake
caliper (13).
Do not support the brake caliper by the brake
hose. Do not operate the brake lever after the
front wheel is removed. To do so will cause
difficulty in fitting the brake disc between the
brake pads.
NOTICE
(12) fork protector (13) brake caliper
9. Loosen the fork leg lower pinch bolts (14),
then pull the fork legs down and out.
(14) lower pinch bolts
(6)
(5)
(7)
(8)
(11)
(10)
(10)
(9)
(12)
(13)
(14)
Front Suspension Adjustments
Adjustments for Competition 97
13.Hold the outer tube (18), then remove the fork
damper (19) from the outer tube using a lock
nut wrench (20). Gently slide the outer tube
down onto the lower end of the slider (21).
10.Clean the fork assembly, especially the sliding
surface of the slider (15) and dust seal (16).
The outer tube can drop on the slider and
damage the fork dust seal and guide bushing
when the fork damper is removed. To avoid
damage hold both the outer tube and slider when
removing the fork cap.
NOTICE
(15) slider (16) dust seal
11.Record the rebound damping adjuster position
and turn the adjuster counterclockwise until it
stops.
12.Measure the length (17) between the axle
holder and outer tube and record it before
disassembling the fork.
(18) outer tube (20) lock nut wrench
(19) fork damper (21) slider, lower end
14.Pour the fork oil from the outer tube.
Pour the fork oil from the oil hole (22) of the
fork damper.
(22) oil hole
15.Temporarily install the fork damper to the
outer tube.
16.Set the lower end (axle holder) (23) of the
slider in a vise with a piece of wood or soft
jaws to avoid to damage.
Overtightening the vise can damage the axle
holder.
17.Loosen the fork center bolt (24).
NOTICE
(23) axle holder (24) fork center bolt
18.Push out the fork center bolt from the axle
holder of the slider by pushing the fork
damper.
19.Make the mechanic's stopper tool out of a thin
piece of steel (1.0 mm thick) as shown if you
do not have the special tool.
(17) length
(15)
(16)
(17)
(20)
(21)
(18)
(19)
(22)
(24)
(23)
(cont’d)
Front Suspension Adjustments
98 Adjustments for Competition
20.Apply pressure to the fork damper and insert a
special tool or mechanic's stopper tool (25)
(see below) between the axle holder (23) and
lock nut (26).
21.Hold the lock nut and remove the fork center
bolt (24) from the fork damper.
Do not remove the lock nut from the fork damper
piston rod. If the lock nut is removed, the piston
rod will fall in the fork damper and you can not
reassemble the fork damper.
NOTICE
(23) axle holder (25) stopper tool
(24) fork center bolt (26) lock nut
22.Remove the push rod (27) from the fork
damper.
23.Remove the special tool or mechanic's stopper
tool between the axle holder (23) and lock nut
(26) while applying pressure to the fork cap.
Be careful not to damage the lock nut and fork
center bolt hole.
NOTICE
(23) axle holder (26) lock nut
(25) tool (27) push rod
24.Remove the fork damper assembly (28) from
the fork assembly (29).
Remove the fork from the vise.
Remove the fork spring (30) from the fork.
(28) fork damper assembly (30) fork spring
(29) fork assembly
(1) fork cap (3) lock nut wrench
(2) fork damper
1. Loosen the fork cap (1) by turning the fork
damper (2) using the lock nut wrench (3).
(23)
(25)
(26)
(24)
(23)
(25)
(27)
(26)
(28)
(30)
(29)
(2)
(1)
(3)
Damper Oil Change
Front Suspension Adjustments
Adjustments for Competition 99
(2) fork damper (4) fork cap assembly
3. Empty the fork oil from the fork damper (2)
by pumping the damper rod several times.
(2) fork damper (5) oil hole
4. Clean the fork cap and fork damper threads.
(2) fork damper
6. Pump the fork damper piston rod (6) slowly
several times to bleed the air from the fork
damper (2).
(2) fork damper (6) piston rod
(2) fork damper
8. Apply fork oil to the bushing and new O-ring
on the fork cap assembly (4).
Extend the fork damper piston rod to
maximum, holding it, install the fork cap
assembly to the fork damper (2).
Be careful not to damage the fork cap bushing.
If it is difficult to install the fork cap assembly,
the fork damper oil level might be higher than
standard oil level. Inspect the fork damper oil
level again.
(2) fork damper (4) fork assembly
(4)
(2)
(2)
(5)
(2)
(2)
(6)
1.65 – 1.85 in
(42 – 47 mm)
(2)
(2)
(4)
7. Extend the fork damper piston rod to
maximum. Adjust the oil level of the fork
damper (2) as shown.
Oil Level: 1.65 – 1.85 in (42 – 47 mm)
5. Extend the fork damper piston rod to maximum.
Pour the recommended fork oil into the fork
damper.
Recommended Oil:
Pro Honda HP Fork Oil 5 W or equivalent
Recommended Amount:
6.0 US oz (178 cc)
2. Remove the fork cap assembly (4) from the
fork damper (2).
Be careful not to damage the fork cap bushing.
Do not disassemble the fork cap assembly.
Replace the fork cap as an assembly if it is
damaged.
(cont’d)
Front Suspension Adjustments
100 Adjustments for Competition
(2) fork damper (6) piston rod
(2) fork damper (8) spring chamber
(10) pressure release screw (11) fork cap
(2)
(6)
(6) piston rod (7) lock nut
Turn the rebound adjuster and compression
adjuster counterclockwise to the softest position.
Check the fork damper piston rod sliding surface
for damage.
Apply fork oil to the fork damper piston rod
sliding surface
Cover the fork piston rod end with soft jaws to
prevent fork damage.
Be careful not to bend or damage the fork
damper piston rod when the piston rod is stroked.
12.Blow the extra oil off to the fork damper (2)
spring chamber (8) by pumping the fork
damper piston rod to full stroke.
NOTICE
(8) spring chamber (9) oil hole
14.Blow out the oil from the fork damper spring
chamber using compressed air to the oil hole.
Wipe the oil completely off the fork damper.
15.If you can not use compressed air, remove the
pressure release screw (10) on the fork cap
(11).
Hold the fork damper up side down for 10
minutes and drain the oil from the fork
damper spring chamber.
(6)
(7)
(8)
(2)
(8)
(9)
(11)
(10)
13.Drain the extra oil from the fork damper
spring chamber (8) oil hole (9).
By doing this procedure, about 17 cm
3
of fork
fluid will be drained from the damper spring
chamber through the oil hole and cause 178 cm
3
of fork fluid to be left in the chamber.
11.Screw in the lock nut (7) to the fork damper
piston rod (6) fully.
(1) fork cap (3) lock nut wrench
(2) fork damper
10.Hold the fork damper (2) in an upright
position and pump the fork piston rod (6) to
3.9 in (100 mm) slowly several times.
(2)
(1)
(3)
9. Tighten the fork cap (1) while holding the cut
out of the fork damper (2) using the lock nut
wrench (3) to the specified torque:
25 Ibf·ft (34 N·m, 3.5 kgf·m)
Front Suspension Adjustments
Adjustments for Competition 101
Fork Assembly
1. Drain the fork oil from the outer tube/slider
(1) by placing it upside down.
(About 7 cc of fork oil will be left in the outer
tube/slider when it is left inverted for about 20
minutes at 20°C/68°F)
(1) outer tube/slider
2. Tighten the lock nut (2) fully and measure the
thread length (A) as shown.
Standard: 0.43 – 0.51 in (11 – 13 mm)
Wipe the oil completely off the fork damper.
(2) lock nut (A) thread length
3. Wipe the oil completely off the fork spring
(3).
Install the fork spring.
Install the fork damper (4) to the outer
tube/slider (1).
(1) outer tube/slider (4) fork damper assembly
(3) fork spring
(1)
Amount of fork oil left in the fork
(without damper and spring) unit: cc
minute
°C/°F
30/86
20/68
10/50
0/32
5
7.1
10.6
11.8
12.9
10
5.9
8.2
8.3
10.6
20
4.7
7.1
7.2
9.4
35
4.2
5.9
6.2
8.2
55
3.5
5.6
5.8
7.9
85
3.5
4.7
4.9
7.1
145
3.5
4.7
4.8
5.9
(A)
(2)
(4)
(3)
(1)
(cont’d)
Front Suspension Adjustments
102 Adjustments for Competition
4. Set the lower end (axle holder) of the slider in
a vise with a piece of wood or soft jaws to
avoid to damage.
Do not overtighten the axle holder.
5. Temporarily install the fork damper to the
fork.
Push out the fork damper piston rod from the
axle holder of the slider by pushing the fork
damper.
Apply pressure to the fork damper and insert
the special tool or mechanic's stopper tool (5)
between the axle holder and lock nut (2).
Measure the thread length again.
Standard: 0.43 – 0.51 in (11 – 13 mm)
6. Install the push rod (6) into the piston rod
until it stops.
Check the push rod installation by turning the
push rod right and left.
7. Install a new O-ring (7) to the fork center bolt
(8).
Install the fork center bolt to the fork damper
piston rod aligning the center bolt adjusting
rod (9) with the push rod. Tighten the center
bolt fully by hand.
NOTICE
(2) lock nut (7) O-ring
(5) stopper tool (8) fork center bolt
(6) push rod (9) adjusting rod
8. Measure the length of the lock nut (2) and
center bolt (8) clearance.
Standard: 0.06 – 0.08 in (1.5 – 2.0 mm)
If the clearance is out of specification, check the
lock nut and center bolt installation.
(2) lock nut (8) center bolt
9. Tighten the lock nut (2) to the fork center bolt
(8) closely by hand. Tighten the lock nut to
the specified torque:
16 Ibf·ft (22 N·m, 2.2 kgf·m)
(2) lock nut
(8) fork center bolt
10.Apply fork oil to the fork center bolt (8) O-
ring.
Remove the special tool or mechanic's stopper
tool while applying pressure to the fork
damper.
Install the center bolt to the axle holder and
tighten it to the specified torque:
51 Ibf·ft (69 N·m, 7.0 kgf·m)
(8) fork center bolt
11.Measure the length between the axle holder
and outer tube.
Standard: 317 ± 2 mm
12.Compare the length (10) at assembly and at
disassembly. They should be the same length.
If the length at assembly is longer than at
disassembly, check the center bolt and lock nut
installation.
(10) length
(8)
(7)
(9)
(5)
(2)
(6)
(2)
(8)
(8)
(2)
(8)
(10)
Front Suspension Adjustments
Adjustments for Competition 103
13.Pour the recommended fork oil (11) into the
outer tube/slider (1).
Recommended Oil:
Pro Honda HP Fork Oil 5 W or equivalent.
(1) outer tube/slider (11) fork oil
(1)
(11)
()
Fork Oil Capacity:
Standard (0.45 kgf/mm) Fork Spring
Standard oil
capacity
12.5 US oz
(371 cm
3
)
Maximum oil
capacity
14.1 US oz
(417 cm
3
)
Slightly stiffer as
it nears full
compression.
Slightly softer as
it nears full
compression.
Minimum oil
capacity
10.9 US oz
(321 cm
3
)
()
Optional Softer (0.43 kgf/mm) Fork Spring
Standard oil
capacity
12.4 US oz
(368 cm
3
)
Maximum oil
capacity
14.0 US oz
(414 cm
3
)
Slightly stiffer as
it nears full
compression.
Slightly softer as
it nears full
compression.
Minimum oil
capacity
10.8 US oz
(318 cm
3
)
No mark
(factory products)
1 scribe mark
1 scribe mark
(aftermarket parts)
or
()
Optional Stiffer (0.47 kgf/mm) Fork Spring
Standard oil
capacity
12.6 US oz
(374 cm
3
)
Maximum oil
capacity
14.2 US oz
(420 cm
3
)
Slightly stiffer as
it nears full
compression.
Slightly softer as
it nears full
compression.
Minimum oil
capacity
11.0 US oz
(324 cm
3
)
1 scribe mark and
3 scribe mark 75 degrees apart
Be sure the oil capacity is the same in both fork
legs.
14.Install the fork damper as described in
Damper Oil Change (page 104-106).
(cont’d)
Front Suspension Adjustments
104 Adjustments for Competition
15.Check that the O-ring (12) on the fork damper
assembly (4) is in good condition. Apply the
recommended fork oil to the O-ring.
(1) outer tube/slider (12) O-ring
(4) fork damper assembly
16.Temporarily thread the fork damper (4) into
the outer tube (1). Insert both fork legs into
the fork clamps. Align the groove in the outer
tube with the top surface of the upper fork
clamp.
If installing the optional 20 inch wheel, align
the top of the outer tube (not the top of the
fork cap) with the top surface of the upper
fork clamp.
Temporarily tighten the fork lower pinch bolts
(13) and then tighten the fork damper (4) to
the specified torque using a special tool:
25 Ibf·ft (34 N·m, 3.5 kgf·m)
For ease of releasing air pressure after the forks
are installed, loosen the lower pinch bolts and
position the outer tubes so that the pressure
release screws are in front of the rebound
damping adjusters.
17.Tighten the fork lower pinch bolts (13) to the
specified torque:
14 Ibf·ft (20 N·m, 2.0 kgf·m)
18.Tighten the fork upper pinch bolts (14) to the
specified torque:
16 Ibf·ft (22 N·m, 2.2 kgf·m)
Over-tightening the pinch bolts can deform the
outer tubes. Deformed outer tubes must be
replaced.
NOTICE
(4) fork damper (14) upper pinch bolts
(13) lower pinch bolts
(4)
(12)
(1)
(13)
(4)
(14)
Front Suspension Adjustments
Adjustments for Competition 105
19.Clean the threads of the fork protector (15)
bolts and axle holder thoroughly.
Apply locking agent to the bolt threads.
Install the fork protector and tighten the bolts
to the specified torque:
5.1 Ibf·ft (7 N·m, 0.7 kgf·m)
(15) fork protector
20.Clean the surfaces where the axle and axle
clamps contact each other.
Install the left and right side collars into the
wheel hub. Insert the front axle shaft through
the wheel hub from the right side. Make sure
the front axle shaft is seated firmly onto the
left fork leg clamp inner surface. Tighten the
axle nut (16) to the specified torque:
65 Ibf·ft (88 N·m, 9.0 kgf·m)
(16) axle nut
21.Align the brake caliper (17) and hose with the
left fork leg, making sure that the brake hose
is not twisted.
22.Clean the threads of the caliper mounting
bolts (18) and brake caliper thoroughly.
Apply locking agent to the bolt threads.
Install the brake caliper on the slider and
tighten the caliper mounting bolts to the
specified torque:
22 Ibf·ft (30 N·m, 3.1 kgf·m)
WARNING
An improperly routed brake hose may
rupture and cause a loss of braking
efficiency. Route the hose carefully
Fit the brake caliper over the disc, taking care
not to damage the brake pads.
NOTICE
(17) caliper
(18) caliper mounting bolts
(15)
(16)
(18)
(17)
(cont’d)
Front Suspension Adjustments
106 Adjustments for Competition
23.Install the handlebar (19), mounting rubbers
(20), washers and handlebar holder nuts (21)
and tighten the handlebar holder nuts to the
specified torque:
33 Ibf·ft (44 N·m, 4.5 kgf·m)
(19) handlebar
(20) mounting rubbers
(21) washers/handlebar holder nuts
24.Install the number plate (22) by aligning its
hole with the tab (23) on the steering stem.
(22) number plate (23) tab
25.Install and tighten the number plate bolt (24).
Install the handlebar pad (25).
(24) number plate bolt
(25) handlebar pad
26.With the front brake applied, pump the fork
up and down several times to seat the axle and
check front brake operation.
27.Tighten the left axle pinch bolts (26)
alternately first.
While keeping the forks parallel, alternately
tighten the right axle pinch bolts to the
specified torque:
14 Ibf·ft (20 N·m, 2.0 kgf·m)
(26) axle pinch bolts
To avoid damage when torquing the axle pinch
bolts, be sure the axle is seated firmly onto the
left fork leg clamp inner surface.
28.Clean the threads of the disk cover bolts and
axle holder thoroughly. Apply locking agent
to the disc cover bolts threads.
Install the disc cover (27) and tighten the disc
cover bolts (28) to the specified torque:
9 Ibf·ft (13 N·m, 1.3 kgf·m)
NOTICE
(27) disc cover (28) disc cover bolts
29.Turn the rebound damping adjusters back to
their original settings.
(19)
(21)
(20)
(22)
(23)
(25)
(24)
(26) (26)
(27)
(28)
Rear Suspension Adjustments
Adjustments for Competition 107
Pin spanners should be used for turning the lock
nut and adjusting nut. See page 147 for optional
pin spanners.
Spring pre-load length (Standard spring)
Standard: 10.29 in (261.3 mm)
Min. : 9.88 in (251 mm)
Spring pre-load length (Optional spring)
Min. (Softer, 5.1 kgf/mm): 9.92 in (252 mm)
Min. (Stiffer, 5.5 kgf/mm): 9.80 in (249 mm)
Min. (Stiffer, 5.7 kgf/mm): 9.88 in (251 mm)
The rear suspension can be adjusted for the
rider’s weight and riding conditions by changing
the spring pre-load and the rebound and
compression damping.
The rear shock absorber assembly includes a
damper unit that contains high pressure nitrogen
gas. Do not attempt to disassemble, service, or
dispose of the damper; see your Honda dealer.
The instructions found in this owner’s manual are
limited to adjustments of the shock assembly
only.
Puncture or exposure to flame may also result in
an explosion, causing serious injury.
Service or disposal should only be done by your
authorized Honda dealer or a qualified mechanic,
equipped with the proper tools, safety equipment
and the official Honda Service Manual.
If your CRF is new, put enough part-throttle
break-in time (about one hour) on it to ensure
that the suspension has worked in.
Rear Suspension Spring Pre-Load
Pre-load should be adjusted when the engine is
cold because it is necessary to remove the
muffler (page 86).
An optional pin spanner is available for turning
the lock nut and adjusting nut to adjust spring
pre-load.
1. Place a workstand under the engine to raise
the rear wheel off the ground.
2. Loosen the connecting tube clamp screw and
remove the rear subframe’s three mounting
bolts, then remove the subframe. See page
32.
3. Check that the spring preload is adjusted to
the standard length. Adjust as necessary by
loosening the lock nut (1) and turning the
adjusting nut (2).
Each complete turn of the adjuster nut
changes the spring length by 1/16 in (1.5
mm).
(1) lock nut (3) pin spanners
(2) adjusting nut (4) spring length
To increase spring pre-load:
Loosen the lock nut with the optional pin spanner
(3) and turn the adjusting nut to shorten the
spring length (4). Do not shorten to less than:
8.5 in (215 mm)
T
o decrease spring pre-load:
Loosen the lock nut with the optional pin spanner
(3) and turn the adjusting nut to increase the
spring length (4). Do not increase to more than:
10.4 in (264 mm)
Each turn of the adjuster changes spring length
and spring pre-load. One turn equals: spring
length/spring pre-load:
0.06 in (1.5 mm) / 17.5 lbs (7.95 kg)
(1)
(4)
(2)
(3)
Rear Suspension Adjustments
108 Adjustments for Competition
(3) rebound damping adjuster
To adjust to the standard position:
1. Turn the adjuster clockwise until it will no
longer turn (lightly seat). This is the full hard
position.
2. Turn the adjuster counterclockwise 9 clicks
with the punch marks on the adjuster and the
shock absorber aligned.
Rear Suspension Damping
Compression Damping
Compression damping may be adjusted in two
stages with separate adjusters.
The high speed damping adjuster (1) is effective
when damping adjustment is desired for high
speed operation. The low speed damping
adjuster (2) should be used when damping
adjustment is desired at relatively low speeds.
• Both the high and low speed compression
damping can be increased by turning the
appropriate adjuster clockwise.
• Adjust the high speed compression adjuster in
1/12 turn increments.
(1) high speed damping adjuster
(2) low speed damping adjuster
High Speed Damping:
The high speed damping can be adjusted by
turning the hexagonal portion of the compression
adjuster.
To adjust to the standard position:
1. Turn the adjuster clockwise until it will no
longer turn (lightly seats). This is the full hard
setting.
2. Turn the adjuster counterclockwise 1-3/4—
2-1/4 turns and the punch marks are aligned.
Low Speed Damping:
The low speed damping can be adjusted by
turning the center screw of the compression
adjuster.
The low speed compression adjuster has 13
positions or more.
Turning the adjuster one full turn clockwise
advances the adjuster four positions.
To adjust to the standard position:
1. Turn the adjuster clockwise until it will no
longer turn (lightly seat). This is the full hard
setting.
2. Turn the adjuster counterclockwise 7 clicks
and the punch marks are aligned.
Rebound Damping
The rebound damping adjuster (3) is located at
the lower end of the shock absorber.
It has 17 positions or more. Turning the adjuster
one full turn advances the adjuster 9 positions.
• Rebound damping can be increased by turning
the adjuster clockwise.
(2)
(1)
1
(3)
Rear Suspension Adjustments
Adjustments for Competition 109
4. Calculate the race sag dimension.
To do this, subtract the loaded with rider
dimension (step 3) from the unloaded
dimension (step 2).
Standard Race Sag: 3.9 in (100 mm)
Adjust spring pre-load as necessary to obtain
the desired handling results.
Decreasing the race sag dimension (example:
3.5 in, 90 mm) improves turning ability for
tight terrain at the cost of slightly reduced
straight line stability.
Increasing the race sag dimension (example:
4.3 in, 110 mm) may improve stability on
faster terrain with less turns, but will reduce
turning performance slightly and may upset
the balance between the front and rear
suspension, producing a harsher ride. This
will happen if the adjustment shifts the
effective wheel travel toward the more
progressive end of its range.
5. Measure the loaded without rider dimension.
Do this with your motorcycle set at the
standard race sag.
Rear Suspension Race Sag
Setting the proper race sag (ride height) is very
important for competition use.
Race sag refers to the amount of rear wheel
travel used by your CRF at rest, ready to ride,
with you on the seat. As a general rule of thumb,
the race sag dimension should be about one-third
of the maximum travel.
On your CRF, ride height is changed by adjusting
the rear suspension spring pre-load.
Spring Pre-load & Race Sag
Adjustment
The following adjustment procedure establishes
the correct starting point for any suspension
tuning — the proper rear spring pre-load
adjustment for your specific needs.
Your CRF should be at normal racing weight,
including fuel and transmission oil. You should
be wearing all your normal protective apparel.
You will need two helpers.
To calculate the proper adjustment, it is necessary
to measure between two fixed points — from the
top of the most rearward point of the subframe
down to the machined edge at the rear of the
wingarm, as illustrated — for three different
situations:
unloaded: motorcycle on optional workstand with
rear suspension fully extended, no rider.
loaded with rider: motorcycle on ground, with
rider.
loaded without rider: motorcycle on ground,
without rider
1. Support your motorcycle on a workstand with
the rear wheel off the ground.
2. Measure the unloaded dimension.
3. Measure the loaded with rider dimension.
Remove the workstand. With two helpers
available, – sit as far forward as possible on
your CRF’s seat, wearing your riding apparel.
Ask one helper to steady your CRF perfectly
upright so you can put both feet on the pegs.
Bounce your weight on the seat a couple of
times to help the suspension overcome any
situation and settle to a good reference point.
Ask the other helper to measure the loaded
with rider dimension.
Example:
Unloaded = 23.6 in (600 mm)
– Loaded = 19.7 in (500 mm)
Race Sag = 3.9 in (100 mm)
UNLOADED MEASUREMENT
(on workstand, without rider)
EXAMPLE: 23.6 in (600 mm)
LOADED MEASUREMENT
(on ground, with rider)
EXAMPLE: 19.7 in (500 mm)
LOADED MEASUREMENT
(on ground without rider)
EXAMPLE: 21.6 in (550 mm)
Example:
Unloaded = 23.6 in (600 mm)
– Loaded = 21.6 in (550 mm)
Sag = 2.0 in (50 mm)
(Without Rider)
(cont’d)
Rear Suspension Adjustments
110 Adjustments for Competition
Because of the great absorption quality of the
shock bumper rubber, it may be difficult for you
to notice when your CRF’s suspension is
bottoming. Some riders may think the damping
or perhaps the leverage ratio is too harsh. In
reality, the problem is most likely insufficient
spring pre-load or a spring that is too soft. Either
situation prevents utilizing the full travel.
Keep in mind that a properly adjusted suspension
system may bottom slightly every few minutes at
full speed. Adjusting the suspension to avoid this
occasional bottoming may cost more in overall
suspension performance than it is worth.
A spring that is too firm for your weight will not
allow the rear tire to hook up under acceleration
and will pass more bumps on to you.
6. Calculate the free sag dimension.
To do this, subtract the loaded without rider
dimension (step 5) from the unloaded
dimension (step 2).
Free sag indicates the distance your rear
suspension should sag from the weight of the
sprung portion of your CRF.
With the spring pre-load set to obtain the
proper race sag, the rear suspension should
sag: 0.39 to 0.98 in (10 to 25 mm)
If the rear of your CRF sags more than 0.98
in (25 mm) from its own weight, the spring is
too stiff for your weight. It is not compressed
enough, even though you have the proper race
sag adjustment. As a result, the rear
suspension will not extend as far as it should.
Spring Rates
If you are lighter or heavier than the average
rider and cannot set the proper ride height
without altering the correct spring pre-load,
consider an aftermarket shock absorber spring.
A spring that is too soft for your weight forces
you to add excessive spring pre-load to get the
right race sag and, as a result, the rear end of the
motorcycle is raised. This can cause the rear
wheel to unload too much in the air and top out
as travel rebounds. The rear end may top out
from light braking, or kick sideways over lips
and square-edged terrain. It may even top-out
when you dismount your CRF.
Suspension Adjustments for Track Conditions
Adjustments for Competition 111
Soft Surface
On soft ground, sand, and especially mud,
consider increasing compression damping front
and rear.
Sand often requires a bit more rebound damping
to minimize rear end kick. Although sand bumps
are usually larger, there’s more distance between
them, giving the shock more time to recover.
You may want a little bit stiffer front suspension
for sand tracks to help keep the front end up and
improve straight-line stability.
In a muddy event, stiffer aftermarket springs
front and rear may help, especially if you are
heavier than the average rider. Your CRF may be
undersprung because of the added weight of the
clinging mud. This additional weight may
compress the suspension too much and affect
traction.
Hard Surface
For a fast, hard track with no large jumps, you
can probably run the same spring as normal, but
run softer damping both ways-compression and
rebound. If you run softer rebound damping, the
wheel will follow the rough ground and small
bumps much better, and you will hook up better.
With a lot of rebound damping, the wheel returns
very slowly and doesn’t contact the ground
quickly enough after each bump. The result is a
loss of traction and slower lap times.
Suspension Adjustment Guidelines
112 Adjustments for Competition
Follow the procedures described below to accurately adjust your CRF, using the methods described on pages 94 - 108. Remember to make all adjustments in
one-click increments. Test ride after each adjustment.
Front Suspension Adjustment
Adjustments for Type of Track
Adjustments for Too Soft/Stiff Damping
Hard-surfaced track
Sand track
Mud track
Begin with the standard setting. If the suspension is too stiff/soft, adjust according to the chart below.
Adjust to a stiffer position.
Example: – Turn the compression damping adjuster to a stiffer position.
– Install the optional stiff spring. (Adjust compression damping to a softer position and rebound damping to a harder position at
this time.)
Adjust to a stiffer position because mud build-up increases your CRF’s weight.
Example: – Turn the compression damping adjuster to a stiffer setting.
– Install the optional stiff spring.
Soft
suspension
Symptom
Initial travel too soft:
• Steering is too quick.
• Front end darts while cornering or riding in a straight line.
Middle travel too soft:
• Front end dives when cornering.
Final travel too soft:
• Bottoms on landings.
• Bottoms on large bumps, especially downhill bumps.
Entire travel too soft:
• Front end shakes.
• Fork bottoms over any type of terrain.
Action
– Test stiffer compression damping adjustments in one-click increments.
– Test stiffer rebound damping in one-click increments.
If suspension isn’t stiff in initial travel:
– Test stiffer compression damping adjustments in one-click increments.
If initial travel becomes stiff because of the above adjustment:
– Reduce the rebound damping in one-click increments.
– Test softer compression damping adjustments in one-click increments.
If that doesn’t solve the problem, install the optional stiff spring.
If initial and middle travel aren’t stiff:
– Test stiffer compression damping adjustments in one-click increments.
If initial and middle travel are stiff:
– Install the optional stiff spring.
If initial travel is stiff after installing the optional stiff spring:
– Test soft compression damping adjustments in one-click increments.
If initial travel is still soft after installing the optional stiff spring:
– Test stiffer compression damping adjustments in one-click increments.
If final travel is still soft after installing the optional stiff spring:
– Increase the fork oil level in increments of 0.2 oz (5 cc).
– Install the optional stiff spring.
– Test stiffer compression damping adjustments in one-click increments.
– Increase rebound damping in one-click increments.
Suspension Adjustment Guidelines
Adjustments for Competition 113
Stiff
suspension
Symptom
Initial travel too stiff:
•
Stiff on small bumps while riding at full throttle in a straight line.
• Stiff on small cornering bumps.
• Front end wanders while riding at full throttle in a straight line.
Middle travel too stiff:
• Stiff on bumps when cornering.
• Front end wanders when cornering.
• Stiff suspension on bumps, especially downhill bumps.
• While braking, front end dives during initial travel, then feels stiff.
Final travel too stiff:
• Doesn’t bottom on landings, but feels stiff.
• Stiff on large bumps, especially downhill bumps.
• Stiff on large bumps when cornering.
Entire travel too stiff:
• Stiff suspension on any type of terrain.
Action
– Test softer compression damping adjustments in one-click increments.
– Reduce the rebound damping adjustments in one-click increments.
– Check for dirt in the dust seals. Check the fork oil for any contamination.
If the front end dives while cornering, reduce the rebound damping in one click
increments. If that doesn’t solve the problem, install the optional stiff spring.
If the stiff spring makes the suspension too stiff over the full range of travel:
test softer compression damping adjustments in one-click increments until the
desire compression damping for initial travel is obtained.
If initial travel isn’t stiff:
– Test stiffer compression damping adjustments in one-click increments. (This
should produce smooth fork action from initial to middle travel.)
If initial and middle travel is stiff:
– Test softer compression damping adjustments in one-click increments.
– Reduce the rebound damping in one-click increments.
If initial and middle travel aren’t stiff:
– Test stiffer compression damping adjustments in one-click increments. (This
should produce smooth fork action from initial to middle travel.)
If final travel is still stiff after the above adjustment, or
If initial and middle travel becomes stiff:
– Install the optional stiff spring.
– Test softer compression damping adjustments in one-click increments.
If the entire travel feels stiff after the above adjustment:
– Test softer compression damping adjustments in one-click increments until the
desired initial travel compression damping is obtained.
– Lower the oil level by 0.2 oz (5 cc).
– Test softer compression damping adjustments in one-click increments.
– Reduce the rebound damping in one-click increments.
– Lower the oil level by 0.2 oz (5 cc).
Suspension Adjustment Guidelines
114 Adjustments for Competition
Rear Suspension Adjustment
Adjustments for Type of Track
Symptoms and Adjustment
• Always begin with the standard settings.
• Turn the low speed compression and rebound adjusters in one-click increments, and the high speed compression adjuster in 1/6 turn increments at a time. Adjusting two or
more clicks or turns at a time may cause you to pass over the best adjustment. Test ride after each adjustment.
• If, after setting, the suspension feels unusual, find the corresponding symptom in the table and test stiffer or softer compression and/or rebound damping adjustments until
the correct settings are obtained as described.
Hard-surfaced track
Sand track
Mud track
Begin with the standard settings. If the suspension is too stiff/soft, adjust according to the chart below.
Lower the rear end (to improve front wheel stability) by increasing Race Sag (reduce spring preload).
Example: – Turn the compression damping adjuster and, especially, rebound damping adjuster to a stiffer setting.
– Increase standard Race Sag (+0.2 to 0.4 in/5 to 10 mm).
Adjust to a stiffer position because mud build-up increases your CRF’s weight.
Example: – Adjust the compression and rebound damping adjusters to stiffer settings.
– Install the optional stiff spring.
– Reduce standard Race Sag (–0.2 to 0.4 in/5 to 10 mm).
Stiff suspension
Soft suspension
Suspension bottoms
Symptom
Suspension feels stiff on small
bumps
Suspension feels stiff on large
bumps
Entire travel too stiff
Entire travel too soft
Rear end sways
Suspension bottoms at landing
after jumping
Suspension bottoms after landing
Suspension bottoms after end of
continuous bumps
Action
1. Test softer low speed compression adjustment.
2. If it still feels stiff, further test softer low and high speed compression adjustments simultaneously.
1. Test softer high speed compression adjustment.
2. If it still feels stiff, further test softer low and high speed compression adjustments simultaneously.
1. Test softer high and low speed compression adjustments and rebound adjustment simultaneously.
2. If it still feels stiff, replace the spring with a softer spring (optional) and begin with the standard settings to
softer settings.
1. Test stiffer high and low speed compression adjustments simultaneously.
2. If it still feels soft, replace the spring with a harder spring (optional) and begin with the standard settings to
stiffer setting.
1. Test stiffer high and low speed compression adjustments and rebound adjustment to stiffer settings
simultaneously.
1. Test stiffer high speed compression adjustment.
2. If it still bottoms, test stiffer high and low speed compression adjustments, and replace the spring with a
harder spring (optional) if necessary.
1. Test stiffer low speed compression adjustment.
2. If it still bottoms, test stiffer high and low speed compression adjustments, and replace the spring with a
harder spring (optional) if necessary.
1. Test softer rebound dumping adjustment.
2. If it still bottoms, test stiffer high and low speed compression adjustments and softer rebound damping
adjustment, and replace the spring with a harder spring (optional) if necessary.
Carburetor Adjustments & Tuning Tips
Adjustments for Competition 115
The carburetor on your CRF should perform
suitably with the standard recommended settings
under average load, climatic, and barometric
conditions. However, to fine tune the engine’s
power output, the carburetor may require
adjustments for specific competition needs.
Optional main jets and slow jets are available for
your CRF. See your Honda dealer.
Any engine or airbox modifications or the use of
an aftermarket exhaust system may require
jetting changes.
Carburetor Components
Cold Start Circuit
A very rich mixture must be delivered to the
cylinder when cold engine is being started. When
the choke knob (1) is pulled out, fuel is metered
by the starter jet (2) and is mixed with air from
the air passage (3) (located above the throttle
valve (4)) to provide a rich mixture for starting.
The mixture discharges through the orifice (5)
into the cylinder.
(1) choke knob (4) throttle valve
(2) starter jet (5) orifice
(3) air passage
Hot Start Circuit
A lean mixture must be delivered to the cylinder
when a hot engine is being started. When the hot
start lever is pulled back, the hot start valve (1)
opens, allowing air to be supplied to the main
bore (2) through the hot start air passage (3). This
extra air enters the air-fuel mixture from the slow
circuit resulting in a lean condition.
(1) hot start valve
(2) main bore
(3) hot start air passage
3
(1)
(5)
(2)
(4)
(3)
(2)
(1)
(3)
(cont’d)
Carburetor Adjustments & Tuning Tips
116 Adjustments for Competition
Accelerator Pump Circuit
The accelerator pump circuit operates when the
throttle is opened. As the throttle valve (1) opens,
the pump rod (2) depress the diaphragm (3). At
this time, the inlet check valve (4) is shut
resulting in a sharp increase in pressure in the
pump chamber (5). The outlet check valve (6)
then opens, supplying fuel to the main bore via
the accelerator nozzle (7).
(1) throttle valve (5) pump chamber
(2) pump rod (6) outlet check valve
(3) diaphragm (7) accelerator nozzle
(4) inlet check valve
Slow Circuit
Fuel is metered by the slow jet (1) and mixed
with air from the air passage (2). The mixture
enters the venturi through the bypass (3) and
pilot outlet (4) that has been metered by the pilot
screw (5).
(1) slow jet (4) pilot outlet
(2) air passage (5) pilot screw
(3) bypass
Main Circuit
Fuel is metered by the main jet (1), jet needle (2)
and needle jet (3). It is then mixed with air
coming from the air jet (4) and enters the venturi
past the needle jet.
Baf
fle Plate
The baffle plate (5) prevents foaming of fuel or
abnormal fuel level around the main jet.
Float Bowl
The float (6) and float valve (7) operate to
maintain a constant level of fuel in the float
bowl.
(1) main jet (5) baffle plate
(2) jet needle (6) float
(3) needle jet (7) float valve
(4) air jet
(3)
2
(1)
(7)
(6)
(2)
(5)
(4)
(3)
(2)
(1)
(5)
(4)
(6)
(4)
(2)
(7)
(5)
(1)
(3)
Adjustments for Competition 117
Carburetor Adjustments & Tuning Tips
Carburetor Circuit Functions
The carburetor has several major circuits, each
providing the fuel/air mixture over a given
portion of throttle valve opening.
These major circuits overlap as shown below.
Slow Jet and Pilot Screw
The slow jet and pilot screw affects fuel/air ratio
over fully closed to 1/4 throttle.
Adjust the pilot screw to obtain the best off-idle
performance.
• If the engine blubbers (rich) exiting a corner,
turn the pilot screw clockwise to lean the
mixture.
• If the engine surges (lean) exiting a corner,
turn the pilot screw counterclockwise to
richen the mixture.
The minimum to maximum range of pilot screw
adjustment is 1/2 to 2 1/2 turns out from the
lightly seated position.
If you exceed 2 1/2 turns out, the next larger
slow jet is needed.
If you are under 1/2 turns out, the next smaller
slow jet is needed.
Carburetor Removal
1. Turn the fuel valve OFF.
2. Drain the remaining fuel in the float bowl by
removing the float bowl plug (1).
WARNING
Gasoline is highly flammable and
explosive. You can be burmed or
seriously injured when handing fuel.
• Stop the engine and keep heat, sparks
and flame away.
• Handle fuel only outdoors.
• Wipe up spills immediately.
(1) float bowl plug
3. Install the float bowl plug.
(2)
(1)
(1) straight section (2) clip
(1)
Jet Needle
The jet needle controls fuel/air mixture over fully
closed to 3/4 throttle. The straight section (1)
affects throttle response at smaller throttle
openings. By changing the position of the clip
(2) in its groove, you can improve acceleration at
medium low and medium speed.
Main jet
The main jet affects fuel/air ratio from half (1/2)
to full throttle (4/4). The size should be reduced
at higher altitudes.
Honda carburetor jet sizes are numbered in
increments of 2 or 3. When changing the main jet
size, increase or decrease it gradually until the
desired jetting is obtained. Because Honda jet
size numbers do not correspond with other
carburetor manufacturer’s jet size numbers, use
only Honda jets.
(cont’d)
Carburetor Adjustments & Tuning Tips
118 Adjustments for Competition
4. Disconnect the fuel line (2) from the fuel
valve (3).
5. Remove the fuel tank (page 30).
6. Remove the sub-frame (page 32).
7. Loosen the intake band screw (4).
(2) fuel line
(3) fuel valve
(4) intake band screw
8. Disconnect the throttle sensor connector (5).
9. Remove the carburetor.
(5) throttle sensor connector
10.Remove the hot start cable holder (6).
(6) hot start cable holder
11.Disconnect the rear suspension (7) upper
mounting nut (8).
(7) rear suspension
(8) upper mounting nut
12.Remove the throttle drum cover bolt (9) and
throttle drum cover (10).
(9) throttle drum cover bolt
(10) throttle drum cover
13.Loosen the lock nut (11), adjusters (12) and
disconnect the throttle cables (13) from the
throttle drum (14).
Remove the carburetor to the rearward from
the frame
.
(11) lock nut (13) throttlr cables
(12) adjusters (14) throttle drum
(3)
(2)
(4)
(5)
(6)
(8)
(7)
(9)
(10)
(12)
(13)
(11)
(14)
Carburetor Adjustments & Tuning Tips
Adjustments for Competition 119
Carburetor Disassembly
1. Pull up the cable clamp (1) and remove the
carburetor top bolts (2).
Then remove the carburetor top (3).
(1) cable clamp
(2) carburetor top bolts
(3) carburetor top
2. Remove the jet needle holder (4) and jet
needle (5) from the throttle valve (6).
(4) jet needle holder
(5) jet needle
(6) throttle valve
3. Remove the link arm set screw (7).
When installing the link arm set screw, apply
a locking agent to the link arm set screw
threads.
4. Remove the throttle valve (8), throttle valve
roller (9) and floating valve (10).
(7) link arm set screw (9) throttle valve roller
(8) throttle valve (10) floating valve
When installing the floating valve (10) onto
the throttle valve (8) make sure the floating
valve’s flat side faces out and the hole (11)
faces down.
(8) throttle valve
(10) floating valve
(11) hole
(3)
(1)
(2)
(5)
(4)
(6)
(7) (8)
(9)
(10)
(8)
(11)
(8)
(10)
(cont’d)
Carburetor Adjustments & Tuning Tips
120 Adjustments for Competition
5. Remove the accelerator pump cover screws
(12) and accelerator pump cover (13).
(12) accelerator pump cover screws
(13) accelerator pump cover
6. Remove the D-ring (14), O-ring (15) spring
(16) and diaphragm (17).
Clean the diaphragm.
When installing the D-ring into the accelerator
pump cover (13) make sure the D-rings
flatside faces down, away from the float bowl
(18).
(13) accelerator pump cover (16) spring
(14) D-ring (17) diaphragm
(15) O-ring (18) float bowl
7. Remove the holder screw (19), throttle stop
screw holder (20), float bowl screws (21),
tube guides (22) and float bowl (18).
(18) float bowl
(19) holder screw
(20) throttle stop screw holder
(21) float bowl screws
(22) tube guides
8. Remove the pump rod (23).
Clean the pump rod and rod passage (24).
Install the pump rod into the link lever (25).
Push the rod forcibly into the link lever until
it snaps into place.
(23) pump rod (25) link lever
(24) rod passage
(26) float level
(27) float level gauge
(28) carburetor intake
10.Remove the leak jet (29) from the float bowl
(18).
Clean the leak jet.
9. Measure the float level (26) with the float
level gauge (27) during float tab just
contacting the float valve and the carburetor
intake (28) facing up. The float level should
be 0.31 in (8.0 mm).
Adjust the float level by bending the float tab
carefully.
(18) float bowl (29) leak jet
(13)
(12)
(12)
(14)
(18)
(14)
(13)
(16)
(17) (15)
(21)
(20)
(21)
(18)
(21)
(22)
(19)
(21)
(22)
(25)
(23) (25)
(23)
(24)
(26)
(27)
(28)
(29)
(18)
Carburetor Adjustments & Tuning Tips
Adjustments for Competition 121
Carburetor Assembly
To assemble, reverse the disassembly procedures.
To install the carburetor, reverse the removal
procedures.
• After installing the carburetor, adjust the
throttle cable (1) free play and hot start cable
(2) free play.
• After installing the carburetor, check the air
vent hoses (3) and overflow hose (4) for
kinking or pinching and correct routing as
necessary.
(1) throttle cables
(2) hot start cable
(3) air vent hoses
(4) overflow hose
(2)
(1)
(3)
(3)
(4)
(3)
(4)
Carburetor Adjustments & Tuning Tips
122 Adjustments for Competition
Standard Tuning Recommendations
For the following recommendations to be
accurate, you must use the standard settings as a
baseline. Also, don’t change any of the settings
until you’ve determined what changes are
necessary.
Adjustment
Pilot screw opening
Slow jet
Jet needle
Needle clip position
Main jet
Float level
Identification number
Standard settings
1–3/4 turns out
#42
NCYQ
3rd groove
#172
0.31 in (8.0 mm)
FCR01B
Adjustments for Altitude & Temperature
All jetting recommendations are based on
standard jetting with an unmodified engine. The
following conditions can affect the fuel mixture.
All jetting is based on
• Standard jetting
• Unmodified Engine
Legend
PS: Pilot Screw opening from fully seated
SJ: Slow Jet
JN: Jet Needle
NC: Needle Clip position
MJ: Main Jet
TEMPERATURE
ALTITUDE
10,000 ft
to
7,500 ft
PS:
SJ:
JN:
NC:
MJ:
1 3/4
42
NCYQ
3rd
172
1 3/4
42
NCYQ
3rd
170
1 1/2
42
NCYQ
2nd
170
1 1/2
42
NCYQ
2nd
168
1 1/2
42
NCYQ
2nd
168
1 1/4
42
NCYQ
2nd
165
1 1/4
42
NCYQ
2nd
165
7,499 ft
to
5,000 ft
PS:
SJ:
JN:
NC:
MJ:
1 3/4
42
NCYQ
3rd
175
1 3/4
42
NCYQ
3rd
172
1 3/4
42
NCYQ
3rd
170
1 1/2
42
NCYQ
2nd
170
1 1/2
42
NCYQ
2nd
168
1 1/2
42
NCYQ
2nd
168
1 1/4
42
NCYQ
2nd
165
4,999 ft
to
2,500 ft
PS:
SJ:
JN:
NC:
MJ:
2
42
NCYQ
4th
175
1 3/4
42
NCYQ
3rd
175
1 3/4
42
NCYQ
3rd
172
1 3/4
42
NCYQ
3rd
170
1 1/2
42
NCYQ
2nd
170
1 1/2
42
NCYQ
2nd
168
1 1/2
42
NCYQ
2nd
168
2,499 ft
to
1,000 ft
PS:
SJ:
JN:
NC:
MJ:
2
42
NCYQ
4th
178
2
42
NCYQ
4th
175
1 3/4
42
NCYQ
3rd
175
1 3/4
42
NCYQ
3rd
172
1 3/4
42
NCYQ
3rd
170
1 1/2
42
NCYQ
2nd
170
1 1/2
42
NCYQ
2nd
168
999 ft
to
Sea Level
PS:
SJ:
JN:
NC:
MJ:
2
42
NCYQ
4th
178
2
42
NCYQ
4th
178
2
42
NCYQ
4th
175
1 3/4
42
NCYQ
3rd
175
1 3/4
42
NCYQ
3rd
172
1 3/4
42
NCYQ
3rd
170
1 1/2
42
NCYQ
2nd
170
FAHR.
-21°~ 0° -1°~ 20° 19°~ 40° 39°~ 60° 59°~ 80° 79°~ 100° 99°~ 120°
STANDARD
JETTING
Condition Mixture will be Component affectedAdjust to
Richen
Lean
Richen
Lean
Lean
Lean
Main jet
(jet needle stage)
Rich
Lean
Rich
Rich
Cold temperature
Warm temperature
Dry air
High humidity
High altitude
Carburetor Adjustments & Tuning Tips
Adjustments for Competition 123
Special Tuning Conditions
There are some unique atmospheric conditions or
situations that may require additional
adjustments.
It should not be necessary to go more than one
jet size richer or leaner to fine tune your
motorcycle. If larger jetting changes are
necessary, check for air leaks, blocked or
restricted exhaust or fuel systems, or a dirty air
cleaner.
Condition
long straights
uphill sections
sand
mud
high humidity
raining
hotter than 113 °F (59 °C)
Main Jet Adjustment
next larger
next smaller
Onece you’ve adjusted the carburetor for
temperature and altitude, it shouldn’t need major
readjustment unless race conditions change
drastically. However, there are some unique
atmospheric conditions or race day situations that
may require additional adjustments. They are as
follows.
To prevent engine damage, always adjust the
main jet before adjusting the jet needle. Always
choose the next richer jet if there is any doubt so
there is a margin for safety.
Main Jet • Go richer on the main jet, by one
number, when: the track has a very
long straightaway or uphill section,
a high percentage of sand, or the
track is muddy.
• Go leaner on the main jet, by one
number, when: it is very humid or
raining, or it is hotter than 113
degrees F.
After using the chart, and making any
adjustments for special conditions, it shouldn’t be
necessary to go more than one jet size richer or
leaner to fine tune your CRF. If larger jetting
changes are necessary, check for worn crankshaft
seals, air leaks, blocked or restricted exhaust or
fuel systems, or a dirty air cleaner.
Pre-Adjustment Checks
Before adjusting carburetor settings, check the
following:
• air cleaner
• air leaks
• float level
• clogged carburetor jets
• spark plug fouling (improper heat range or
other cause)
• freshness of fuel
• owner modifications (such as exhaust system,
holes in the air box, etc.)
• ignition timing
• compression
If the above check out, then, adjust the carburetor
for your specific racing conditions. Engine
response and appearance of the firing end of a
spark plug are highly indicative of the engine
condition.
Refer to the list on page 147 for the optional
carburetor parts.
To prevent engine damage, always adjust the
main jet before adjusting the jet needle. If there
is any doubt — always choose the next richer jet
so there is a margin for safety.
Carburetor Adjustments & Tuning Tips
124 Adjustments for Competition
Carburetor Minor Adjustments
The standard carburetor settings are ideal for the
following conditions: sea level altitude, and 20°C
(68 °F) air temperature. If your conditions are
different, you may need to adjust the carburetor
settings, using the tuning information on page
122 and 123. Confirm your settings are correct
before proceeding.
Minor
Adjustments
1. Adjust the carburetor setting using the tuning
information on page 122 and 123.
2. When the engine is warm enough to run
without the choke, push the choke knob down
to its off position.
3. Adjust the pilot screw (1) to obtain the best
off-idle performance.
– If the engine blubbers (rich) exiting a
corner, turn the pilot screw clockwise to
lean the mixture.
– If the engine surges (lean) exiting a corner,
turn the pilot screw counter clockwise to
richen the mixture.
The minimum to maximum range of pilot screw
adjustments is 1 to 3 turns out from the lightly
seated position. If you exceed 3 turns out, the
next smallest slow jet is needed. If you are under
1 turn out, the next larger slow jet is needed.
(1) pilot screw
Adjustment Procedure
1. Turn the pilot screw in until it is lightly seated
and record the number of turns. Turn the pilot
screw out the same number of turns.
2. Warm up the engine.
3. Adjust the engine idle speed (page 48).
4. Make 2 – 3 laps of a course with the standard
setting or corrected jetting (page 122). and
spark plug. Note engine acceleration and
other engine conditions in relation to throttle
opening. Verify carburetion by removing the
spark plug and reading its firing end (page
54). It may take more than two or three laps
to get a good spark plug reading with a new
spark plug.
WARNING
Gasoline is highly flammable and
explosive. You can be burned or
seriously injured when handing fuel.
• Stop the engine and keep heat, sparks
and flame away.
• Handle fuel only outdoors.
• Wipe up spills immediately.
8. Turn the fuel valve OFF, and disconnect the
fuel line from the fuel valve.
9. Loosen the connecting and insulator band
screws. Rotate the carburetor.
(2) float bowl plug
(1)
(1)
(2)
5. Change carburetor settings or select suitable
carburetor jets, taking into consideration the
engine conditions and factors for temperature
and altitude (page 122).
6. Adjust the pilot screw as required.
7. If you’ve determined that the main and slow
jets must be changed, you must rotate the
carburetor and remove the float bowl plug.
10. Remove the float bowl plug (2).
Carburetor Adjustments & Tuning Tips
Adjustments for Competition 125
11.Change the main jet (3) and slow jet (4) as
required.
(3) main jet
(4) slow jet
12.Reinstall the float bowl plug.
13.If you’ve determined that the jet needle or clip
position of jet needle must be changed, you
must remove the carburetor top.
14.Remove the fuel tank (page 30).
15.Rotate the carburetor to the left and remove the
carburetor top bolts (5) and carburetor top (6).
(5) carburetor top bolts
(6) carburetor top
16.Remove the jet needle holder (7), insert the
carburetor maintenance tool (8) to the jet
needle (9) from the throttle valve (10), and
remove it.
(7) jet needle holder
(8) carburetor maintenance tool
(9) jet needle
(10) throttle valve
17.Change the clip position of jet needle or jet
needle as required.
18.Reinstall the jet needle, jet needle holder
carburetor top and carburetor top bolts.
19.Install the fuel tank (page 31).
20.Rotate the carburetor and align the lug (11) on
the carburetor with the slot (12) on the intake
tube.
(11) lug (12) slot
21.Tighten the connecting and intake tube band
screws.
22.Connect the fuel line.
23.Start the engine.
If the engine idle speed is too high or too low
or engine is not idling, adjust the engine idle
speed (page 48).
24.Repeat steps 4 – 23 until the engine gives
maximum power with the correct spark plug
reading. It is always better to jet a little rich
than a little lean. It is advisable to record the
settings, course conditions, lap times, and
climatic and barometric conditions for future
reference.
(3)
(4)
(3)
(4)
(5)
(6)
(7)
(8)
(10)
(9)
(11)
(12)
Carburetor Adjustments & Tuning Tips
126 Adjustments for Competition
Spark Plug Reading
Refer to Spark Plug on page 54.
Check any jetting change by reading the spark
plug. The following procedure is recommended.
You may not get an accurate reading if you
simply turn off the engine and pull the plug for
inspection.
Use a new spark plug. Inspect the plug before
installing it.
Using spark plugs with an improper heat range
or incorrect reach can cause engine damage.
Before removing the spark plug, clean the spark
plug area thoroughly to prevent dirt from
entering the cylinder.
Ride for 10 - 15 minutes before taking a plug
reading. A new plug will not color immediately.
To obtain an accurate reading of a new spark
plug:
1. Accelerate at full-throttle on a straight.
2. Push the engine stop button and pull the
clutch lever in to release the clutch.
3. Coast to a stop.
4. Remove the spark plug.
5. Use a magnifying glass to inspect the spark
plug. The porcelain insulator (1) around the
center electrode (2) should appear clean and
colorless with a gray ring around the center
electrode where it exits the porcelain.
Metallic specks indicate lean jetting that is
removing metal from the piston. Black sooty
streaks on the porcelain indicate rich jetting.
NOTICE
Condition
Normal
Overheating
(Lean)
Wet
(Rich)
Spark Plug Appearance
Dark brown to light tan
color with dry electrode
Light gray or white color
Wet or sooty
Mixture
correct
lean
rich
Improperly tightened spark plugs can damage the
engine. If a plug is too loose, a piston may be
damaged. If a plug is too tight, the threads may
be damaged.
NOTICE
(1) insulator (3) side electrode
(2) center electrode
Spark Plug Coloring Guidelines
Remember that in addition to improper jetting:
• A lean condition can be caused by air leaks in
the inlet tract or exhaust system, the passage
of too much air because of the use of the
wrong air cleaner, use of a less-restrictive
aftermarket exhaust system, or a hole or holes
(deliberate or unitentional) in the air box.
• A rich condition can be caused by a plugged
or dirty air cleaner, use of a more-restrictive
aftermarket exhaust system, a clogged spark
arrester, or excessive oil on the air cleaner.
Excessive smoking will occur.
(2)
(3)
(1)
(4) standard position
for optional front
wheel 0 in (0 mm)
(5) top of outer tube
(6) upper fork clamp
Chassis Adjustments
Adjustments for Competition 127
The following suggestions may improve a
specific concern. Subtle changes in overall
handling may also be noted.
Rear End
If you have a problem with rear wheel traction,
raise the rear end of your motorcycle by
increasing the rear spring pre-load. Instead of
running 3.9 in (100 mm) of sag, you can run 3.5
in (90 mm) so the rear of the bike will sit a little
higher. This should produce more traction
because of the change to the swingarm and the
location of your motorcycle’s center of gravity.
If you have a problem with the steering head
shaking when you use the front brake hard or if
your motorcycle wants to turn too quickly, lower
the rear of the motorcycle by reducing the rear
spring pre-load. This will increase fork rake and
trail and should improve stability in a straight
line. The effective suspension travel will be
transferred toward the firmer end of wheel travel.
Keep the race sag adjustment (page 109) in the
3.5 - 3.9 in (90 – 100 mm) range.
Fork Height/Angle
The position of the fork tubes in the clamps is
not adjustable. Align the groove in the outer tube
with the top surface of the upper fork clamp.
If you install the optional 20 inch wheel, align
the top of the fork tube with the top of the upper
fork clamp.
Standard Position
The standard position (1) aligns the index groove
(2) with the top of the upper clamp (3).
Standard Position For Optional Front
Wheel
If you install the optional 20 inch wheel, align
the top of the fork tube (5) (not the top of the
fork cap) with the top of the upper fork clamp
(6).
Wheelbase
Adjusting your CRF’s wheelbase can offer subtle
changes in overall handling. You may adjust
wheelbase by adding or removing links on the
drive chain. If you change the wheelbase, be
sure to re-check race sag and adjust, if necessary.
In the past, a general rule was lengthen the
wheelbase to add straight line stability, shorten
the wheelbase to improve turning. However, we
suggest you do not lengthen the wheelbase of
your CRF unless you are racing on a track with
more fast sections than normal.
As a general recommendation, keep the
wheelbase as short as possible. This positions
the wheels closer together, improves turning
response, increase weighting (traction) on the
rear wheel, and lightens weighting on the front
wheel.
With your CRF, you will probably find that the
standard setting or a shorter wheelbase will offer
more overall benefits.
(1)
(2)
(3)
(4)
(5)
(6)
(1) standard position
0.3 in (7 mm)
(2) groove
(3) upper fork clamp
Gearing
128 Adjustments for Competition
You can “adjust” the power delivery of the
standard engine to suit track conditions by
changing gearing. This allows you to utilize a
different portion of the engine’s power range at a
given throttle setting. New gearing may provide
the change you are looking for without the need
to consider further modifications.
The portion of your engine’s power range you
use can be adjusted by changing the final drive
ratio with different sized rear sprockets. Gearing
changes allow you to more closely match the
type of terrain and the available traction.
Normally, a change of one tooth on the rear
sprocket will be sufficient.
There is a choice of both higher and lower final
drive ratios with two optional aluminum driven
sprockets. For muddy or sandy courses, there is
a more durable steel driven sprocket with the
standard number of teeth. Like the optional
springs, these sprockets are listed in the Optional
Parts List section of this manual.
Unless you have the required mechanical
knowhow, tools, and an official Honda Service
Manual, sprocket changing should be done by
your Honda dealer.
Higher Gearing (less rear sprocket teeth)
• increases top speed in each gear (provided the
engine will pull the higher gearing)
• reduces frequency of shifting (wider gear
ratios)
• reduces engine rpm at a given throttle setting
or ground speed (which may allow better rear
wheel traction on slippery or loose terrain)
However:
• the engine may not pull the higher gearing
• the spacing between gears may be too wide
• engine rpm may be too low
Lower Gearing (more rear sprocket teeth)
• decrease top speed in each gear
• increases frequency of shifting (narrower gear
ratios)
• increases engine rpm at a given throttle
setting or ground speed (which may provide
more power-to-the-ground on good traction
surfaces)
However:
• spacing between gears may be too narrow
• engine rpm may be too high
Some tracks may be watered heavily prior to the
first race, then lightly or not at all during the day.
This results in a track surface that is slippery
during the first few races, then changes from
good to great and back to good and possibly ends
the day with a slick rock-hard consistency.
Ideally, your gearing should be adjusted to suit
all these conditions.
• Wet and slippery or sandy conditions: use a
higher gear (less teeth) to keep engine rpm
down, and avoid unwanted wheelspin. The
engine may bog in certain corners so you’ll
need to slip the clutch to compensate;
downshifting may be too drastic a change in
speed.
• Average conditions: use the standard sprocket.
• Hard (but not slippery) track conditions: use
lower gearing (more teeth) to keep the engine
rpm high where the engine produces the most
power. This may require an extra upshift on
certain sections or perhaps you can just rev it
out a bit longer.
For tight tracks, consider lower gearing to avoid
having to slip the clutch frequently. Repeated
fanning or pulling of the clutch lever in a turn to
raise engine rpm may eventually damage the
clutch system.
A gearing change may help for riding in sand,
where you want to keep the front end light so it
can float from the peak of one sand whoop to the
next. Generally, with higher gearing, it is easier
to maintain that perfect attitude (maximum rear
wheel traction and a light front end) because you
remain in the powerband longer in each gear.
The higher gearing allows you to steer more
efficiently with throttle control and body English.
If you are riding a track with sections where you
choose to over-rev the engine temporarily rather
than shifting up, higher gearing might help.
Sometimes you have to sacrifice performance on
one section of the track to gain a better overall
time. Your goal is the fastest overall lap time,
even if the cost is some sections where the
gearing feels wrong.
If you decide to try a gearing change, have
someone check your times with a stopwatch
(before and after the change) to get an accurate
appraisal of the change. “Seat-of-the-pants”
feelings can’t be trusted. Eliminating wheelspin
with a gearing change can make you feel like
you’re going slower when, in reality, you’ve
decreased your time by increasing your speed
with better traction.
These gearing recommendations should be
evaluated by considering your ability, your riding
style, and the track.
Tire Selection for Track Conditions
Adjustments for Competition 129
Choosing the correct tire tread pattern and rubber
compound can affect your placing in competition.
The tires on your CRF offer a “happy medium”
for the variety of soil conditions the majority of
riders are likely to encounter.
Experienced competitors often switch to tires
developed for specific terrain conditions. If you
do switch, stay with the factory recommended
sizes. Other tires may affect handling or
acceleration.
Be aware that tire sizes (width and aspect ratio)
do vary from manufacturer to manufacturer or
even among tires made by the same
manufacturer. Variations in tires, especially the
sidewall profile, can change the attitude of your
CRF and its handling. Tire variations that raise
or lower the rear of your CRF have a more
significant effect on handling than variations in
front tires which, generally, don’t vary as much.
Often, you can see or feel the change in tire size.
Another way to check is to measure the rolling
circumference of the old and new tires. A higher
profile tire will have a larger rolling
circumference.
If you do switch to tires designed for special
terrain use, remember they will be less
acceptable in other circumstances. For example,
an aggressive mud tire will give excellent grip on
wet, loamy terrain, but less impressive grip on a
hard surface.
If you choose a tire with a sticky compound for
added traction, remember that it may transfer
additional loads to the transmission because it
grips so well, especially when riding in situations
that normally place unusual demands on the
transmission.
Complete consumer information can be obtained
from the various tire manufacturer
representatives and dealers.
Some general recommendations for specific
terrain follow:
Hard, Slick Soil
Use tires with many relatively short knobs that
are close together in order to obtain the largest
possible contact patch on the surface. The rubber
compound needs to be softer for hard ground in
order to hook up, but not so soft that the knobs
roll over easily and affect holding a straight line.
These tires tend to wear more quickly than
standard tires because of the combination of soft
rubber and hard terrain.
Muddy Soil
Use a more open tread pattern to avoid clogging.
For these conditions, the relatively long knobs
will probably be made from a harder rubber
compound to reduce any tendency to bend back
under acceleration or wear quickly.
Loose, Sandy Soil
Use a tire that is similar in construction to those
needed for tacky soil and mud, but with a few
more knobs.
Personal Fit Adjustments
130 Adjustments for Competition
The following suggestions may make your ride
both more comfortable and more responsive to
your control input.
Control Positioning
• Position the control levers so that you can use
them comfortably when seated and standing.
• Adjust the mounting bolt torque of the clutch
and brake lever assemblies so that they can
rotate on the handlebar in a fall. If an
assembly does not rotate, it may bend or
break a control lever. Make sure that the
bolts are torqued securely enough to prevent
slippage during normal operation.
Apply Honda Thread Lock or an equivalent to
the threads of these bolts prior to adjustment to
help ensure the correct torque is retained.
Tighten the top bolts first.
1) control lever mounting bolts
As an alternative, consider wrapping the
handlebar area under the control assemblies with
teflon tape. Then tighten the assemblies to their
normal torque. Upon impact, the fully-tightened
assemblies should rotate on the Teflon tape.
• Position the shift lever and brake pedal so
they are close to your boot for rapid access,
but not so close that either is depressed when
sitting or standing comfortably on your CRF.
Handlebar Position, Width & Shape
• Position the handlebar so that both gripping
the bar and operating the controls is
comfortable while both seated and standing,
while riding straight ahead and turning.
Tighten the forward bolts first.
• The handlebar position may be moved
rearward either 3 mm (using optional
handlebar lower holders) or 6 mm (by rotating
the standard holders 180 degrees). Refer to
the Service Manual for installation
instructions. Be sure to check control cable
and wiring harness routing after the
adjustment.
• Chamfer the edges to remove burrs and other
irregularities or roughness after sawing the
handlebar.
• An alternate handlebar shape, through varying
rise or rearward sweep dimensions, will
provide further adjustment to riding position
and may better suit your particular body size
or riding style. Each of the ergonomic
dimensions of the machine were determined
to suit the greatest possible number of riders
based on an average size rider.
(1) (1)
• Handlebar width can be trimmed with a
hacksaw to better suit your particular shoulder
width and riding preference. Think this
through carefully and cut off just a small
amount at a time from both sides equally. It is
obviously much easier to make the handlebar
narrower than it is to add material.
Tips
Tips 131
Here’s helpful advice on how to transport and
store your Honda, as well as two troubleshooting
flow charts.
Transporting Your Motorcycle .........................132
Storing Your Honda..........................................133
You & the Environment ...................................134
Troubleshooting................................................135
Transporting Your Motorcycle
132 Tips
If you use a truck or motorcycle trailer to
transport your Honda, we recommend that you
follow these guidelines:
• Use a loading ramp.
• Make sure the fuel valve is off.
• Secure the motorcycle in an upright position,
using motorcycle tie-down straps. Avoid
using rope, which can loosen and allow the
motorcycle to fall over.
To secure your CRF, brace the front wheel
against the front of the truck bed or trailer rail.
Attach the lower ends of two straps to the tie-down
hooks on your vehicle. Attach the upper ends of
the straps to the handlebar (one on the right side,
the other on the left), close to the fork.
Check that the tie-down straps do not contact any
control cables or electrical wiring.
Tighten both straps until the front suspension is
compressed about half-way. Too much pressure
is unnecessary and could damage the fork seals.
Use another tie-down strap to keep the rear of the
motorcycle from moving.
We recommend that you do not transport your
CRF on its side. This can damage the
motorcycle, and leaking gasoline could be a
hazard.
Storing Your Honda
Tips 133
If you won’t be riding for an extended period,
such as during the winter, thoroughly inspect
your Honda and correct any problem before
storing it. That way, needed repairs won’t be
forgotten and it will be easier to get your CRF
running again.
To reduce or prevent deterioration that can occur
during storage, also follow the following
procedures.
Preparation for Storage
1. Completely clean all parts of your CRF. If
your CRF has been exposed to sea air or salt
water, wash it down with fresh water and
wipe dry.
2. Change the engine oil and filter (page 37).
3. Replace the transmission oil (page 40).
4. Drain the fuel tank and carburetor into an
approved gasoline container.
Turn the fuel valve OFF and remove the
carburetor drain bolt. Drain gasoline into an
approved container. Reinstall the drain bolt.
WARNING
Gasoline is highly flammable and
explosive. You can be burned or
seriously injured when handling fuel.
• Stop the engine and keep heat, sparks
and flame away.
• Handle fuel only outdoors.
• Wipe up spills immediately.
5. Remove the radiator cap and coolant drain bolt
(1) at the water pump (2) to drain coolant.
After the coolant has been completely
drained, ensure that the drain bolt sealing
washer is in good condition and reinstall the
drain bolt and radiator cap.
(1) drain bolt (2) water pump
6. Lubricate the drive chain.
7. Remove the spark plug and pour a tablespoon
(0.51 - 0.68 US oz; 15 - 20 cm
3
) of clean
engine oil into the cylinder. With the spark
plug grounded or the engine stop button
pressed in, crank the engine several times to
distribute the oil, then reinstall the spark plug.
8. Inflate the tires to their recommended
pressures.
9. Place your CRF on the optional work-stand or
equivalent to raise both tires off the ground.
Removal from Storage
1. Uncover and clean your CRF.
Change the engine and transmission oil if
more than 4 months have passed since the
start of storage.
2. Uncover the end of the muffler and remove
the rag from the muffler outlet.
3. Fill the fuel tank with recommended fuel
(page 34).
4. Pour a fresh recommended coolant mixture
(page 41) slowly into the radiator filler hole
up to the filler neck.
Capacity:
1.06 US qt (1.00R)
at disassembly
0.98 US qt (0.93R)
at draining
Lean your CRF slightly right and left several
times to bleed trapped air in the cooling
system.
If the coolant level lowers, add coolant and
repeat the above procedure.
Install the radiator cap securely.
5. Perform all maintenance checks (page 21).
(2)
(1)
10. Stuff a rag into the muffler outlet. Then tie a
plastic bag over the end of the muffler to
prevent moisture from entering.
11. Store your CRF in an unheated area, free of
dampness, away from sunlight, with a
minimum of daily temperature variation.
12. Cover your CRF with a porous material.
Avoid using plastic or similar non-breathing,
coated materials that restrict air flow and
allow heat and moisture to accumulate.
You & the Environment
134 Tips
Owning and riding a motorcycle can be
enjoyable, but you must do your part to protect
nature. When you show respect for the land,
wildlife, and other people, you also help preserve
the sport of off-road riding.
Following are tips on how you can be an
environmentally-responsible motorcycle owner.
• Choose Sensible Cleaners. Use a
biodegradable detergent when you wash your
CRF. Avoid aerosol spray cleaners that
contain chloroflur carbons (CFCs) which
damage the atmosphere’s protective ozone
layer. Don’t throw cleaning solvents away;
see the following guidelines for proper
disposal.
• Recycle Wastes. It’s illegal and thoughtless to
put used engine oil in the trash, down a drain,
or on the ground. Used oil, gasoline, and
cleaning solvents contain poisons that can hurt
refuse workers and contaminate our drinking
water, lakes, rivers, and oceans.
Before changing your oil, make sure you have
the proper containers. Put oil and other toxic
wastes in separate sealed containers and take
them to a recycling center. Call your local or
state office of public works or environmental
services to find a recycling center in your area
and get instructions on how to dispose of
nonrecyclable wastes.
Improper disposal of drained fluids is harmful to
the environment.
NOTICE
Troubleshooting
Tips 135
The items that are serviceable using this Manual
are followed by the page number reference in
parenthesis. The items that require use of the
Honda Service Manual are followed by an
asterisk.
POOR PERFORMANCE AT LOW AND UNSTABLE
IDLE SPEED
CHECK POSSIBLE CAUSES
1. Check if air
cleaner is over-
oiled (P-43)
CORRECT
INCORRECT
INCORRECT
LEAKING
CLOGGED
LOW
WAKE OR
INTERMITTENT
SPARK
CORRECT
CORRECT
NOT LEAKING
NOT CLOGGED
GOOD SPARK
2. Check if the intake
tube is leaking
3. Check carbureator
pilot screw
adjustment (P-124)
4. Check carburetor
jets and accelerator
pump for clogs
5. Try spark test
6. Check for
low compression.
• Over-oiled air cleaner.
• Loose insulator clamp
• Damaged insulator
• Fuel-air mixture too
lean (Turn the pilot
screw out) (P-124)
• Fuel-air mixture too rich
(Turn the pilot screw in)
(P-124)
• Contaminants in the
fuel
• Not cleaned frequently
enough (P-117)
• Faulty, carbon or wet
fouled spark pulg (P-54)
• Faulty ignition control
module*
• Faulty alternator*
• Faulty ignition coil*
• Broken or shorted
spark plug wire.
• Faulty ignition pulse
generator*.
• Ring worn
• Cylinder worn or
damaged
• Piston worn or
damaged
• Head gasket not
sealing
POOR PERFORMANCE AT HIGH SPEED
CHECK POSSIBLE CAUSES
1. Disconnect fuel
line at carburetor
and check for
clogging (P-34)
UNRESTRICTED
FUEL FLOW
FUEL FLOW
RESTRICTED
CLOGGED
DIRTY
INCORRECT
LOW
WEAK OR
INTERMITTENT
SPARK
NOT CLOGGED
CORRECT
CORRECT
GOOD SPARK
2. Remove air
cleaner (P-43)
4. Check carbureator
jets for clogging
5. Check valve
timing
6. Try spark test
7. Check for
low compression.
AIR FILTER
NOT DIRTY
3. Install a larger
carburetor main
jet (p-124)
CORRECT
CONDITION
WORSE
• Lack of fuel in tank
(P-34)
• Clogged fuel line
(P-34)
• Clogged fuel fill
cap breather tube
(P-34)
• Clogged fuel valve
(P-34)
• Clogged fuel filter
(P-35)
• Not cleaned
frequently enough
(P-43)
• Jet size wrong, rejet
in the opposite
direction (P-124)
• Contaminants in
the fuel
• Cam sprocket not
installed properly
• Faulty, carbon or wet
fouled spark pulg
(P-54)
• Faulty ignition control
module*
• Faulty alternator*
• Faulty ignition coil*
• Broken or shorted
spark plug wire.
• Faulty ignition pulse
generator*.
• Ring worn
• Cylinder worn or
damaged
• Piston worn or
damaged
• Head gasket not
sealing
136 Tips
Technical Information
Technical Information 137
This section contains dimensions, capacities, and
other technical data.
Vehicle Identification .......................................138
Specifications ...................................................139
Torque Specifications.......................................140
High Altitude Carburetor Adjustment ..............143
Oxygenated Fuels.............................................144
Competition Logbook ......................................145
Optional Parts List ...........................................147
Spare Parts & Equipment.................................148
Wiring Diagram................................................149
Vehicle Identification
138 Technical Information
Serial Numbers
The frame, VIN, and engine serial numbers are
required when you register your motorcycle.
They may also be required when ordering
replacement parts. You may record these
numbers in the Quick Reference section at the
rear of the manual.
The VIN (vehicle identification number) (1)
appears on the Safety Certification Label
attached to the left side of the frame.
LEFT SIDE
(1) vehicle identification number
The frame number (2) is stamped on the right
side of the steering head.
RIGHT SIDE
(2) frame number
The engine number (3) is stamped on the left
crankcase.
LEFT SIDE
(3) engine number
(1)
(2)
(3)
Specifications
Technical Information 139
Overall length
Overall width
Overall height
Wheelbase
Seat height
Footpeg height
Ground clearance
Dry weight
Item English
85.5 in
32.6 in
50.3 in
58.2 in
38.0 in
17.6 in
14.2 in
204 Ibs
Metric
Type
Dimension
Frame
Fork oil capacity
(except fork damper
per leg)
F. suspension
R. suspension
F. tire size, pressure
psi (kPa, kgf/cm
2
)
R. tire size, pressure
psi (kPa, kgf/cm
2
)
F. brake, swept area
R. brake, swept area
Fuel capacity
Caster angle
Trail length
Twin tube
Telescopic fork,
travel 11.0 in (279 mm)
stroke 12.4 in (315 mm)
Pro-link,
travel 12.3 in (313 mm)
80/100 – 21 51M
15 (100, 1.0)
100/90 – 19 57M
15 (100, 1.0)
Single disc brake
51.8 in
2
(334.5 cm
2
)
Single disc brake
60.6 in
2
(391.1 cm
2
)
27.50˚
1.9 US gal
4.8 in
14.1 US oz
416 cm
3
123 mm
7.3 liter
Item English
3.07 x 2.06 in
0.31 in
Cylinder arrangement
Bore and stroke
Displacement
Compression ratio
Engine oil capacity
After draining
After draining and
oil filter change
After disassembly
After disassembly
Transmission oil
capacity
After draining
Type
Identification number
Main jet (standard)
Jet needle (standard)
Piston valve
FCR01B
# 172
NCYQ
Needle clip position
(standard)
Slow jet (standard)
Pilot screw opening
Float level
Liquid cooled, 4-stroke
Single 10˚ inclined from
vertical
0.70 US qt
0.73 US qt
0.90 US qt
0.63 Imp qt
0.74 US qt
3rd groove
# 42
1–3/4 turns out
Type
Metric
660 cm
3
690 cm
3
850 cm
3
600 cm
3
700 cm
3
78.0 x 52.2
mm
8.0mm
Engine
Carburetor
12.9 : 1
Clutch type
Transmission
Primary reduction
Gear ratio I
Gear ratio II
Gear ratio III
Gear ratio IV
Gear ratio V
Final reduction
Item English Metric
Drive train
Electrical
Wet, multi-plate type
5-speed, constant mesh
3.166
2.142
1.750
1.450
1.227
1.041
3.923
Gear shift pattern
Ignition
Starting system
Spark plug :
Standard
For extended high
speed riding
ICM
Kickstarter
Left foot-operated return
system 1-N-2-3-4-5
NGK R0409 B-8
NGK R0409 B-9
2,172 mm
827 mm
1,277 mm
1,479 mm
965 mm
446 mm
361 mm
92.7 kg
15.2 cu-in 249.4 cm
3
Torque Specifications
140 Technical Information
Nuts, Bolts, Fasteners
Check and tighten nuts, bolts, and fasteners before every outing.
Engine
Item
1
2
3
4
5
6
7
8
9
10
ENGINE
Cylinder head cover
Exhaust pipe joint nut
Water pump cover
Crankshaft hole cap
Transmission oil check
bolt
Clutch cover
Cylinder bolt
Oil filter cover
Cylinder head bolt
Drive sprocket
Torque
Remarks
lbf
•
ft N
•
m kgf
•
m
7
15
7
11
7
7
7
9
7
23
10
21
10
15
10
10
10
12
10
31
1.0
2.1
1.0
1.5
1.0
1.0
1.0
1.2
1.0
3.2
(8)
(9)
(7)
(10)
(1)
(2)
(3)
(5)
(4)(6)
RIGHT SIDE
LEFT SIDE
Torque Specifications
Technical Information 141
Frame
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
FRAME
Steering stem nut
Fork bridge upper pinch
bolts
Fork bridge lower pinch
bolts
Handlebar upper
holder bolts
Handlebar holder nuts
Front axle nut
Front axle pinch bolts
Rear axle nut
Chain adjuster lock nuts
Engine mounting bolts
Front engine hanger
bracket bolts
Mid engine hanger
bracket bolt
Upper engine hanger
plate bolts
(engine side)
(frame side)
Shock absorber (upper)
(lower)
Swingarm pivot nut
Fork (fork damper)
(fork cap)
Rear shock arm nuts
(swingarm side)
(shock link side)
Rear shock link nuts
(Frame side)
Shock spring lock nut
Kickstarter arm bolt
Torque
Remarks
lbf
•
ft N
•
m kgf
•
m
80
16
15
16
33
65
15
94
20
47
47
47
40
25
33
33
65
25
22
38
38
39
33
28
108
22
20
22
44
88
20
128
27
64
64
64
54
34
44
44
88
34
30
52
52
53
44
38
11.0
2.2
2.0
2.2
4.5
9.0
2.0
13.0
2.8
6.5
6.5
6.5
5.5
3.0
4.5
4.5
9.0
3.5
3.1
5.3
5.3
5.4
4.5
3.9
NOTE 1
NOTE 2
NOTE 1
NOTE 1
NOTE 1
NOTE 1, 3
NOTE 1, 3
NOTE 1, 3
1. U-nut.
2. UBS nut.
3. Apply oil to the threads and flange surface.
4. Alock bolt.
NOTES:
(19)
(9)
(20)
11
(4)
(2)
(1)
(3)
(11)
(6)
(10)
(15)
(14)
(13) (14)
(16)
(5)
(7)
(12)
(18)
(17)
(8)
Torque Specifications
142 Technical Information
Item
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
FRAME
Front brake master
cylinder holder bolts
Brake hose bolts
Caliper mounting bolts
Front brake disc nuts
Rear brake disc nuts
Brake pedal pivot bolt
Front spoke
Rear spoke
Rim locks
Subframe bolts (upper)
(Iower)
Fork center bolt
Fork center lock nut
Disc cover bolts
Fork protector bolts
Muffler mounting
bolts (front)
(rear)
Muffler clamp bolt
Sprocket nuts
Seat mounting bolts
Front brake reservoir
cap screws
Rear brake reservoir
cap bolts
Fork air pressure release
screw
Torque
Remarks
lbf
•
ft N
•
m kgf
•
m
7
25
22
12
12
23
2.8
2.8
9.6
22
36
51
16
9
5.1
19
19
15
24
19
0.7
0.7
0.9
9.9
34
30
16
16
31
3.68
3.7
13
30
49
69
22
13
7
26
26
21
32
26
1.0
1.0
1.2
1.0
3.5
3.1
1.6
1.6
3.2
0.38
0.38
1.3
3.1
5.0
7.0
2.2
1.3
0.7
2.7
2.7
2.1
3.3
2.7
0.1
0.1
0.12
NOTE 4
NOTE 1
NOTE 1
NOTE 4
NOTE 1
1. U-nut.
2. UBS nut.
3. Apply oil to the threads and flange surface.
4. Alock bolt.
NOTES:
Frame
(35)
(28)
(27)
(29)
(36)
(22)
(32)
(24)
(21)
(38)
(22)
(40)
(33)
(30) (31)
(26)
(22)
(39)
(27)
(28)
(25)
(22)
(37)
(34)
(23)
Technical Information 143
High Altitude Carburetor Adjustment
NOTICE
When operating this motorcycle at high altitude,
the air-fuel mixture becomes overly rich.
Above 6,500 feet (2,000 m), driveability and
performance may be reduced and fuel
consumption increased. The carburetor can be
modified to compensate for this high altitude
richness.
However, the carburetor must be returned to
standard factory specifications when lower
altitude riding is desired. See your Honda dealer
for high altitude modification.
Sustained operation at altitudes below 5,000 feet
(1,500 m) with high altitude carburetor
modifications may cause engine overheating and
damage.
144 Technical Information
Oxygenated Fuels
Some conventional gasolines are being blended
with alcohol or an ether compound. These
gasolines are collectively referred to as
oxygenated fuels. To meet clean air standards,
some areas of the United States and Canada use
oxygenated fuels to help reduce emissions.
If you use an oxygenated fuel, be sure it is
unleaded and meets the minimum octane rating
requirement.
Before using an oxygenated fuel, try to confirm
the fuel’s contents. Some states/provinces
require this information to be posted on the
pump.
The following are the EPA-approved percentages
of oxygenates:
ETHANOL (ethyl or grain alcohol) 10% by
Volume
You may use gasoline containing up to 10%
ethanol by volume. Gasoline containing ethanol
may be marketed under the name “Gasohol”.
MTBE (Methyl Tertiary Butyl Ether) 15% by
Volume
You may use gasoline containing up to 15%
MTBE by volume.
METHANOL (methyl or wood alcohol) 5% by
Volume
You may use gasoline containing methanol
containing up to 15% methanol by volume as
long as it contains cosolvents and corrosion
inhibitors to protect the fuel system. Gasoline
containing more than 5% methanol by volume
may cause starting and/or performance problems.
It may also damage metal, rubber, and plastic
parts of your fuel system.
If you notice any undesirable operating
symptoms, try another service station or switch
to another brand of gasoline.
Fuel system damage or performance problems
resulting from the use of an oxygenated fuel
containing more than the percentages of
oxygenates mentioned above are not covered
under warranty.
Oxygenated the fuels can damage paint and
plastic. Be careful not to spill fuel when filling
the fuel tank. Wipe up any spills immediately.
Oxygenated fuels can damage paint and plastic.
NOTICE
Consumer Information 145
Competition Logbook
Any serious competition effort relies heavily on
the knowledge gained and compiled from
previous racing events. The best way to organize
the many bits of information is to record them in
a logbook.
Your logbook can include such information as
suspension adjustments, carburetor adjustments,
gearing, and tire selection. This detailed
information, along with your comments, can
prove valuable when you compete at the same
track or on similar terrain.
Your logbook can also tell you when
maintenance was performed and when it will be
necessary again. Your logbook also lets you
record any repairs and lets you keep track of the
running time on the engine and suspension
components.
If you choose to sell your CRF, the accurate
maintenance records in your logbook might be
the deciding deal-maker for a potential buyer.
Consider using different color pens or pencils to
record important information on specific
subjects. For example, record results in black,
jetting changes in red, suspension/chassis settings
in blue, and gearing selections in green. Color
codes will help you identify the information you
want with a glance.
Tuning & Adjustment Records
Keep track of the settings and adjustments that
worked best at a particular location. These items
include:
• basic track conditions, altitude, and
temperature
• carburetion changes
• suspension settings
• chassis adjustments tested and selected
• gearing
• tire selection
• air pressure
Competition Records
• your placings
• thoughts to improve performance next time:
both yours and your motorcycle’s
• strategy notes
Maintenance Records
• regular interval maintenance
• repairs
• running time on engine
• running time on suspension components
Timekeeping
This Manual lists maintenance intervals for
every-so-many races or every-so-many hours of
running.
Because all races are not the same, the most
effective way to schedule maintenance is by the
hours you have run your CRF.
An official “guestimate” is close enough for our
timekeeping purposes. You may choose to record
your time the same way aircraft operators do (but
without the benefit of an electrical hourmeter).
All running time is broken down into hours and
tenths of an hour (each six minutes represents
one tenth of an hour).
Racing Records
Information worth recording for this section of
your logbook may include:
• Your placing in each moto and overall
finishing position.
• Thoughts on what you could do to improve
your performance next time.
• Notes on any patterns noted in choice of
starting gate positions or in riding portions of
the course as the day progressed that may
prove helpful in future events.
• Any places on the course where you chose the
wrong line and were passed too easily.
• Notes on strategy used by your competition or
by riders in another event that are worth
remembering.
Maintenance Records
Regular maintenance items you’ll want to record
in your logbook should include:
• Dates and results of cylinder, piston and ring
examinations
• Patterns for frequency of need for
decarbonization with a particular oil
• When you last performed shock linkage and
swingarm pivot bearing maintenance
• Engine, transmission, and suspension oil
changes
• chain, sprocket, chain guide and slider
replacements
• coolant changes and related component
replacements
• Spark plug, brake pad and control cable
replacements
In addition, you should record any irregularities
noted in component wear so you’ll remember to
keep a close eye on these areas in the future.
Date Running Location/Event Comments (Jetting, Suspension Settings, Gearing, Chassis Adjustments, Maintenance
Time Performed, etc.)
(Make several photocopies of this page for future use)
146 Consumer Information
Competition Logbook
FRAME Remarks
Shock spring
Standard
Stiffer
Optional
Softer
Stiffer
Fork spring
Standard
Optional
Softer
The standard fork spring and shock spring
mounted on the motorcycle when it leaves the
factory are not marked. Before replacing the
springs, be sure to mark them so they can be
distinguished from other optional springs.
296.8 lbf/in (5.30 kgf/mm)
No mark
(factory products)
Red
paint
(aftermarket parts)
or
285.6 lbf/in (5.10 kgf/mm)
25.20 lbf/in (0.45 kgf/mm)
24.08 lbf/in (0.43 kgf/mm)
26.32 lbf/in (0.47 kgf/mm)
Jet needle number
(1/2 clip position
leaner than
standard series.
leaner only at 1/8
to 3/4 throttle)
NCVN
Ø2.725 mm
NCVP
Ø2.735 mm
NCVQ
Ø2.745 mm
NCVR
Ø2.755 mm
NCYN
Ø2.725 mm
NCYP
Ø2.735 mm
(standard needle)
NCYQ
Ø2.745 mm
NCYR
Ø2.755 mm
NCYS
Ø2.765 mm
NCVS
Ø2.765 mm
CARBURETOR Remarks
Main jet
(Standard: #172)
Slow jet
(Standard: #42)
#162 – #182 (in increments of
2 or 3)
#38 – #48
(in increments of 2 or 3)
Jet Needles
Standard needle: NCYQ
Straight diameter: Ø2.745 mm
Jet needle number
(standard series)
TOOLS Remarks
FRAME Remarks
Driven sprocket
Standard
< >: Drive chain links
51 Teeth, Aluminum.
<114>
20 inch
• wheel assembly
(except brake disk)
• tire tube
• tire flap
• rim lock (bead stopper)
• front tire
(90/100-20, 90/100-20 M/C)
Fork height: 0 in (0 mm)
(align the top of the fork tube
with the top of the upper clamp)
Optional
Optional
Optional
50 Teeth, Aluminum
<114>
52 Teeth, Aluminum
<114>
Handlebar
lower holder
Standard 3 mm offset
no offset
Front wheel
Standard
21 inch
Fork height: 0.3 in (7.0 mm)
(align the index groove with the
top of the upper clamp)
Pin spanner A
Workstand
To adjust spring preload.
(two spanners required)
For maintenance
General flow characteristics
Leaner Richer
(at 1/16 to 1/4 throttle)
172
Blue
78.700 mm
78.250 mm
59.41 mm58.96 mm
White
308 lbf/in (5.50 kgf/mm)
319.2 lbf/in (5.70 kgf/mm)
Red
Pink
These parts and tools may be ordered from your
authorized Honda dealer.
1 scribe mark
(aftermarket parts)
3 scribe mark
1 scribe mark and
3 scribe mark 75
degrees apark
Size
Jetneedle number
Straight diameter (2.745 mm)
Technical Information 147
Optional Parts List
148 Technical Information
Spare Parts & Equipment
There are numerous spare parts you can take to
an event to help ensure you get in a full day of
riding. In addition to the usual nuts and bolts,
consider the following:
Spare Parts
spark plugs
air cleaner (clean & oiled, sealed in a plastic bag)
optional carburetor jets/needles
chain & masterlinks
chain guide slider
chain guide
chain rollers
inner tubes (front & rear)
fenders
footpegs
front & side number plates
handlebar
grips
levers (brake, clutch & hot start)
clutch lever handlebar mount
clutch cable
hot start cable
throttle assembly
throttle cable
shift lever
brake pedal
spokes (front & rear, each side)
sprockets (larger & smaller than standard, for
gearing changes & collision damage
replacement)
assorted nuts, bolts, washers, screws, cotter pins
Additional Spares
front brake assembly
rear brake assembly
wheels & tires (front & rear, mounted)
clutch disc and plates
engine & transmission oil
seat
ignition components
top end-complete
radiator hoses
radiator shrouds (L & R)
brake hoses (front & rear)
General Tools
sockets (3/8 in drive)
screwdrivers: blade & Phillips No. 1, 2, 3
wrench, large adjustable
wrenches: open end & box
wrenches: hex (Allen)
wrench, spoke
torque wrench (metric scale, click-stop style)
pliers: standard, needle-nose, channel-lock set
hammer, plastic head
syringe with adjustable stop
tire pressure gauge
tire irons
tire pump or air tank
feeler gauge set
vernier caliper (metric)
pressure/vacuum testing equipment (USA only)
Honda Special Tools
Any special tools for your motorcycle purchased
from your Honda dealer.
• Lock Nut Wrench 07WMA-KZ30100
• Nipple Wrench 07JMA-MR60100
• Nipple Wrench 070MA-KZ30100
Chemical Products
Pro Honda GN4, HP4 (without molybdenum
additives) or HP4M (with molybdenum
additives) 4-stroke Oil
(Engine Oil)
Pro Honda HP Trans Oil or Pro Honda GN4 or
HP4 (without molybdenum additives only)
4-stroke Oil (Transmission Oil)
Honda thread Lock
Pro Honda HP Fork Oil 5W
Honda Brake Fluid
Pro Honda Chain Lube
Pro Honda Foam Filter Oil
Honda brite cleaner
Honda Contact Cleaner
Honda Dielectric Compound
Honda Hand Grip Cement
Honda Hondalock
Honda Moly 60 Paste (U.S.A. only) or
molybdenum disulfide paste (containing more
than 40% molybdenum disulfide additive)
White Lithium Grease
Wheel Bearing Grease
Silicone Sealer
high-temperature grease
antifreeze
Other Products
pliers-safety wire
safety wire
mechanic’s wire
duct tape
plastic tie-wraps
hose clamps
drop light
electrical tape
Technical Information 149
Wiring Diagram
THROTTLE POSITION
SENSOR
SPARK
PLUG
150 Technical Information
Consumer Information 151
Consumer Information
This section contains information about
contacting Honda and how to get an official
Honda service manual.
Authorized Manuals .........................................152
Contacting Honda.............................................153
Your Honda Dealer...........................................154
The Honda Rider’s Club (USA only) ..............155
The Service Manual used by your authorized Honda dealer is available from
Helm, Inc.
Also available, but not necessary to service your model is the Honda Common
Service Manual which explains theory of operation and basic service
information for various systems common to all Honda motorcycles, motor
scooters and ATVs.
These Honda manuals are written for the professional technician, but most
mechanically-capable owners should find them helpful if they have the proper
tools and skills. Special Honda tools are necessary for some procedures.
Order On-Line: www.helminc.com
Order Toll Free: 1-888-CYCLE93 (1-888-292-5393)
(NOTE: For Credit Card Orders Only)
Monday - Friday 8:00 AM - 6:00 PM EST
OR
By completing this form you can order the materials desired. You can pay by
check or money order, or charge to your credit card. Mail to Helm,
Incorporated, at the address shown on this order form.
Canada: See your Honda dealer to order authorized manuals.
152
Consumer Information
Authorized Manuals
Publication Item No. Description Price Each*
61KRN01 2005 CRF250R Service Manual $48.00
61CM002 Common Manual $48.00
31KRN610 2005 CRF250R Owner’s Manual $16.00
*Prices are subject to change without notice and without incurring obligation.
S
H
I
P
T
O
NOTE: Dealers and Companies, please provide dealer or company name, and also
the name of the person to whose attention the shipment should be sent. For
purchases outside U.S.A., please write to the address shown below for a quotation.
Customer Name
Attention
Street Address-No P.O. Box Number Apt. #
City State Zip Code
Daytime Telephone Number ( )
P
A
Y
M
E
N
T
Check or money order enclosed payable to Helm, Inc. U.S. funds only. Do not
send cash.
Master
Card
Account Number
VISAVISA Discover
Check here if your billing
address is different from the
shipping address shown above.
Expiration Date: Mo. Yr
Customer Signature Date
—
These Publications cannot be returned for credit without receiving advance authorization within
14 days of delivery. On returns, a restocking fee may be applied against the original order.
HELM. P.O. BOX 07280 • DETROIT • MI 48207
Item Description Qty.
Publication
Item No.
Price
Each*
Total
Price
Sub Total
Calif Purchasers
Add 8.25 % Sales Tax
Mich. Purchasers
Add 6% Sales Tax
Handling Charge
$5.00
Grand Total
*Prices are subject to change without notice and
without incurring obligation.
Orders are mailed within 10 days. Please allow
adequate time for delivery.
Consumer Information 153
Your owner’s manual was written to cover most
of the questions you might ask about your
Honda. Any questions not answered in the
owner’s manual can be answered by your Honda
dealer. If he doesn’t have the answer right away,
he will get it for you.
If you have a difference of opinion with your
dealer, please remember that each dealership is
independently owned and operated. That’s why
it’s important to work to resolve any differences
at the dealership level.
If you wish to comment on your experiences with
your Honda or with your dealer, please send your
comments to the following address (USA only):
Motorcycle Division, American Honda Motor
Co., Inc., P.O. Box 2220, Torrance CA 90509-
2220, mailstop: 100-4W-5B,
telephone: (310) 532-9811.
Canada: Refer to the warrantly booklet that was
supplied with your vehicle.
Please include the following information in your
letter:
• name, address, and telephone number
• product model, year, and frame/VIN serial
number
• date of purchase
• dealer name and address
We will likely ask your Honda dealer to respond,
or possibly acknowledge your comments directly.
Contacting Honda
Your Honda Dealer
154 Consumer Information
Once you purchase your new Honda, get familiar
with the organization of your Honda dealer so
you can utilize the full range of services
available.
The service department is there to perform
regular maintenance and unexpected repairs. It
has the latest available service information from
Honda.
The parts department offers Genuine Honda
parts, Pro Honda products, Hondaline accessories
(USA only), and Honda accessories and products
(Canada only). The same quality that went into
your Honda can be found in Genuine Honda
replacement parts. You’ll also find comparable
quality in the accessories and products available
from the parts department.
Your dealer can inform you about competition
events in your area. You’ll also find that your
dealer is a source of information (USA only) the
Honda Rider’s Club of America.
We’re sure you’ll be as pleased with the service
your Honda dealer continues to provide after the
sale as you are with the quality and dependability
of your Honda.
Consumer Information 155
The Honda Rider’s Club (USA only)
One of the best ways get the most enjoyment
from owning and riding your Honda is through
the Honda Rider’s Club of America. Your
purchase of a new motorcycle, scooter, ATV or
PWC from a participating U.S. Honda dealer
entitles you to a complimentary one-year
membership in the club. There are handreds of
HRCA Chapter sponsoring dealers across the
USA with events and activities almost every
weekend. Membership benefits include:
• 24-hour, toll-free roadside assistance for your
new Honda (includes roadside assistance for
your transport vehicle as long as your Honda
is aboard or in tow).
• Vehicle transport to the nearest Honda dealer
or service center if necessary.
• An exclusive HRCA website complete with
access to the official Honda Common Service
Manual, contests, insider information and
more.
• Reimbursement (up to $75) for Motorcycle
Safety Foundation training. Separate free
training from the Speialty Vehicle Institute of
America for ATV owners.
• One full year of the Honda Red Rider
magazine or Honda Red Rider ATV (for ATV
purchasers).
• Discounts from HRCA partners for
experienced rider courses.
• Discounted vehicle insurance from the
HRCA’s insurance partner.
• Racing contingency programs and assistance
at selected dual-sport, off-road, and motors
events.
Contact your Honda dealer for more information
or call: 1 800-847-HRCA or log on to
www. hrca. honda. com.
Table of Contents
156 Table of contents
The following presents the contents of each
section of your owner’s manual.
MOTORCYCLE SAFETY...............................1
Important Safety Information..............................2
Important Safety Precautions..........................2
Accessories & Modifications..........................3
Safety Labels.......................................................4
OPERATING CONTROLS .............................5
Component Locations .........................................6
BEFORE RIDING ............................................7
Are You Ready to Ride? .....................................8
Is Your Motorcycle Ready to Ride?....................9
Pre-ride Inspection..........................................9
BASIC OPERATING INSTRUCTIONS ......11
Safe Riding Precautions................................12
Starting & Stopping the Engine ........................13
Preparation ....................................................13
Starting Procedure ........................................13
Flooded Engine.............................................13
How to Stop the Engine................................14
Break-in Guidelines ..........................................15
SERVICING YOUR HONDA........................17
Before You Service Your Honda
The Importance of Maintenance .......................18
Maintenance Safety...........................................19
Important Safety Precautions........................19
Maintenance Schedule ......................................20
General Competition Maintenance ...................22
Before & After Competition Maintenance........26
Between Motos & Practice Maintenance .....26
After Competition Maintenance ...................26
Service Preparations
Component Locations .......................................28
Seat Removal ....................................................29
Fuel Tank Removal ...........................................30
Subframe Removal............................................32
Service Procedures
Fluids & Filters
Fuel System.......................................................34
Engine Oil .........................................................36
Transmission Oil ...............................................39
Coolant ..............................................................41
Air Cleaner ........................................................43
Crankcase Breather ...........................................45
Engine
Throttle ..............................................................46
Engine Idle Speed .............................................48
Clutch System ...................................................49
Hot Start Lever..................................................53
Spark Plug .........................................................54
Valve Clearance.................................................55
Piston/Piston Rings/Piston Pin..........................63
Chassis
Suspension.........................................................71
Front Suspension Inspection.........................71
Rear Suspension Inspection..........................72
Fork Oil Change ...........................................73
Brakes................................................................76
Wheels...............................................................80
Tires & Tubes ....................................................81
Drive Chain .......................................................83
Exhaust Pipe/Muffler ........................................86
Additional Maintenance Procedures .................89
Appearance Care ...............................................91
ADJUSTMENTS FOR COMPETITION .....93
Front Suspension Adjustments..........................94
Rear Suspension Adjustments.........................107
Suspension Adjustments for Track
Conditions ...................................................111
Suspension Adjustment Guidelines.................112
Carburetor Adjustments & Tuning Tips..........115
Chassis Adjustments........................................127
Gearing ............................................................128
Tire Selection for Track Conditions................129
Personal Fit Adjustments ................................130
TIPS................................................................131
Transporting Your Motorcycle ........................132
Storing Your Honda.........................................133
You & the Environment ..................................134
Troubleshooting...............................................135
TECHNICAL INFORMATION ..................137
Vehicle Identification ......................................138
Specifications ..................................................139
Torque Specifications......................................140
High Altitude Carburetor Adjustment .............143
Oxygenated Fuels............................................144
Competition Logbook .....................................145
Optional Parts List ..........................................147
Spare Parts & Equipment................................148
Wiring Diagram...............................................149
CONSUMER INFORMATION...................151
Authorized Manuals ........................................152
Contacting Honda............................................153
Your Honda Dealer..........................................154
The Honda Rider’s Club (USA only) .............155
Index 157
accessories...........................................................3
adjustments,
altitude and temperature.............................122
carburetor ...................................................115
chassis ........................................................127
engine idle speed..........................................48
for competition.............................................93
gearing........................................................128
high altitude carburetor ..............................143
personal fit..................................................130
suspension, front ..........................................94
suspension, rear..........................................107
suspension, track conditions.......................111
tire selection ...............................................129
after competition maintenance ..........................26
air cleaner ..........................................................43
air pressure,
front suspension ...........................................94
tires...............................................................81
American Honda, contacting...........................153
appearance care .................................................91
authorized manuals..........................................152
basic operation...................................................11
before riding ........................................................7
between motos & practice maintenance ...........26
brakes,
fluid level .....................................................77
lever, front adjustment .................................76
pad wear .......................................................79
pedal height..................................................76
break-in guidelines ............................................15
capacity, fuel .....................................................34
carburetor,
adjustment ..................................................115
circuit functions..........................................117
components.................................................115
disassembly/assembly ................................119
high altitude adjustment.............................143
idle speed......................................................48
minor adjustments......................................124
care, appearance ................................................91
chain drive.........................................................83
chassis adjustment for track conditions ..........127
choke knob ........................................................13
cleaner, air .........................................................43
cleaning, appearance care .................................91
clutch system, adjustment .................................49
consumer information .....................................151
controls, operating...............................................5
component locations,......................................6,28
maintenance..................................................28
operating controls...........................................6
competition logbook........................................145
contacting Honda ............................................153
controls, operating...............................................5
coolant ...............................................................41
customer service..............................................153
damping adjustments,
front..............................................................94
rear..............................................................108
dealer, your Honda ..........................................154
diagram, wiring ...............................................149
drive chain.........................................................83
engine,
flooded .........................................................13
idle speed......................................................48
number .......................................................138
oil .................................................................36
pinging .........................................................34
starting..........................................................13
stop button....................................................14
stopping........................................................14
environment, protecting ..................................134
filter,
air .................................................................43
oil .................................................................37
flooded engine, starting.....................................13
fork,
front suspension adjustment.........................94
front suspension inspection..........................71
oil recommendation......................................73
frame number ..................................................138
front brake lever adjustment .............................76
front suspension maintenance ...........................71
fuel,
line................................................................34
filter..............................................................35
recommendation...........................................34
refueling .......................................................34
system...........................................................34
oxygenated .................................................144
tank capacity ................................................34
valve .............................................................13
F
E
D
C
B
A
Index
158 Index
Index
gap, spark plug ..................................................54
gasohol ............................................................144
gasoline..............................................................34
gearing.............................................................128
guidelines, suspension adjustment ..................112
handlebar inspection..........................................89
high altitude carburetor adjustment ................143
Honda,
contacting ...................................................153
Rider’s Club ...............................................155
Service Manual ..........................................152
your dealer..................................................154
identification, vehicle......................................138
idle speed, engine..............................................48
inspection, pre·ride ..............................................9
labels, safety........................................................4
locations, component......................................6,28
logbook, competition.......................................145
maintenance,
additional procedures ...................................89
after competition ..........................................26
before & after competition...........................26
between motos & practice............................26
general competition......................................22
importance....................................................18
safety ............................................................19
schedule........................................................20
manual, service................................................152
modifications.......................................................3
oil,
engine ...........................................................36
fork ...............................................................73
transmission .................................................39
operating,
controls...........................................................5
instructions ...................................................11
optional,
parts list......................................................147
sprockets.....................................................128
oxygenated fuels..............................................144
pads, brake.........................................................79
parts, optional..................................................147
personal fit adjustments ..................................130
pinging, engine..................................................34
plug, spark .........................................................54
pre-load, rear suspension.................................107
pre·ride inspection ...............................................9
rear suspension maintenance.............................72
Rider’s Club Honda.........................................155
riding,
basic operation .............................................11
before..............................................................7
important safety information..........................2
safety precautions...........................................2
safety,
important information ....................................2
important precautions.....................................2
labels ..............................................................4
maintenance..................................................19
riding precautions...........................................2
schedule, maintenance.......................................20
serial numbers .................................................138
service,
customer .....................................................153
manuals ......................................................152
spare parts........................................................148
spark knock .......................................................34
spark plug
maintenance..................................................54
reading........................................................126
specifications...................................................139
spring pre-load, rear suspension .....................107
starting,
engine ...........................................................13
troubleshooting...........................................135
steering stem inspection ....................................89
stopping engine .................................................14
storage .............................................................133
subframe ............................................................32
S
R
P
O
M
L
I
H
G
Index 159
Index
suspension,
front.........................................................71,94
rear.........................................................72,107
suspension adjustment,
front..............................................................94
rear..............................................................107
for track conditions ....................................111
guidelines ...................................................112
transmission oil .................................................39
tuning tips........................................................115
throttle,
freeplay.........................................................46
inspection .....................................................47
tires,
air pressure ...................................................81
flat ................................................................81
selection......................................................129
tools ...............................................................148
torque specifications........................................140
transporting......................................................132
troubleshooting................................................135
tubes, replacing .................................................81
valve, fuel..........................................................34
vehicle identification.......................................138
washing your motorcycle ..................................91
wheels................................................................80
writing diagram ...............................................149
W
V
T
160 Quick Reference
The maintenance schedule (page 21) lists service frequencies for:
each race or about 2.5 hours,
every 3 races or about 7.5 hours, and
every 9 races or about 22.5 hours
every 12 races or about 30.0 hours
Check the items listed on the Pre-Ride inspection checklist each time before you ride
(page 9):
unleaded gasoline, pump octane number of 91 or higher
tank: 1.9 US gal (7.3R)
Pro Honda GN4 or HP4 (without molybdenum additives) or HP4M (with molybdenum
additives) 4-stroke oil, or an equivalent.
Pro Honda HP Trans oil, Pro Honda GN4 or HP4 (without molybdem additives) 4-stroke
oil, or an equivalent.
Front: 80/100-21 51M, Rear: 100/90-19 57M
Type: bias-ply, tube
Front: 15 psi (100 kPa, 1.0kgf/cm
2
)
Rear: 15 psi (100 kPa, 1.0kgf/cm
2
)
standard: R0409B-8 (NGK)
optional: R0409B-9 (NGK)
D.I.D. 520DMA2
Maintenance
Pre-ride Inspection
Fuel/Capacity
Engine oil
Transmission oil
Tires
Tire Pressure (cold)
Spark Plug
Drive Chain
Quick Reference
Record important information here:
Frame No.
Engine No.
Owner’s:
Name
Address
City/State
Phone
Dealer’s:
Name
Address
City/State
Phone
Service Mgr.
The following is a brief, but important collection
of information you need to know about your
Honda. You’ll also find space to record
important notes.
How To Avoid Costly Repairs
The engine of your Honda can be the most
expensive component to repair. Proper
maintenance, especially the use of the
recommended fluids and filters, prevents
premature wear and damage.
Frequent causes of costly engine repairs are:
• Transmission oil & premix oil: insufficient
quantity, improper oil.
• Air cleaner: dirty, leaking because of
improper installation (poor seal).