Yamaha Wr 450 F Owners Manual

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INSP
ADJFRONT FORK INSPECTION/
FRONT FORK OIL SEAL AND DUST SEAL CLEANING
Tighten the axle nut while pushing down
the drive chain.
T R..
Axle nut:
125 Nm (12.5 m • kg, 90 ft • lb)
Tighten the locknuts.
T R..
Locknut:
16 Nm (1.6 m • kg, 11 ft • lb)
EC36C000
FRONT FORK INSPECTION
1. Inspect:
Front fork smooth action
Operate the front brake and stroke the
front fork.
Unsmooth action/oil leakage → Repair
or replace.
EC36D001
FRONT FORK OIL SEAL AND DUST SEAL 
CLEANING
1. Remove:
Protector
Dust seal 1 
NOTE:
Use a thin screw driver, and be careful not to
damage the inner fork tube and dust seal.
2. Clean:
Dust seal a 
Oil seal b 
NOTE:
Clean the dust seal and oil seal after every
run.
Apply the lithium soap base grease on the
inner tube. 
						

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INSP
ADJFRONT FORK INTERNAL PRESSURE RELIEVING/
FRONT FORK REBOUND DAMPING FORCE ADJUSTMENT
FRONT FORK INTERNAL PRESSURE 
RELIEVING
NOTE:
If the front fork initial movement feels stiff dur-
ing a run, relieve the front fork internal pres-
sure.
1. Elevate the front wheel by placing a suit-
able stand under the engine.
2. Remove the air bleed screw 1 and
release the internal pressure from the
front fork.
3. Install:
Air bleed screw
T R..1 Nm (0.1 m · kg, 0.7 ft · lb)
EC36H002
FRONT FORK REBOUND DAMPING FORCE 
ADJUSTMENT
1. Adjust:
Rebound damping force
By turning the adjuster 1.
Stiffer a →Increase the rebound damp-
ing force. (Turn the adjuster
1 in.)
Softer b →Decrease the rebound damp-
ing force. (Turn the adjuster
1 out.)
Extent of adjustment:
Maximum Minimum
Fully turned in 
position20 clicks out (from 
maximum posi-
tion) 
						

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INSP
ADJFRONT FORK COMPRESSION DAMPING FORCE
ADJUSTMENT
STANDARD POSITION:
This is the position which is back by the spe-
cific number of clicks from the fully turned-in
position.
* For EUROPE, AUS, NZ and ZA
CAUTION:
Do not force the adjuster past the minimum
or maximum extent of adjustment. The
adjuster may be damaged.
WARNING
Always adjust each front fork to the same
setting. Uneven adjustment can cause poor
handling and loss of stability.
Standard position:
10 clicks out
* 8 clicks out
EC36J001
FRONT FORK COMPRESSION DAMPING 
FORCE ADJUSTMENT
1. Remove:
Rubber cap
2. Adjust:
Compression damping force
By turning the adjuster 1.
Stiffer a →Increase the compression
damping force. (Turn the
adjuster 1 in.)
Softer b →Decrease the compression
damping force. (Turn the
adjuster 1 out.)
Extent of adjustment:
Maximum Minimum
Fully turned in 
position20 clicks out 
(from maximum 
position) 
						

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INSP
ADJ
REAR SHOCK ABSORBER INSPECTION
STANDARD POSITION:
This is the position which is back by the spe-
cific number of clicks from the fully turned-in
position.
CAUTION:
Do not force the adjuster past the minimum
or maximum extent of adjustment. The
adjuster may be damaged.
WARNING
Always adjust each front fork to the same
setting. Uneven adjustment can cause poor
handling and loss of stability.
3. Install:
Rubber cap
Standard position:
13 clicks out
EC36K000
REAR SHOCK ABSORBER INSPECTION
1. Inspect:
Swingarm smooth action
Abnormal noise/unsmooth action →
Grease the pivoting points or repair the
pivoting points.
Damage/oil leakage → Replace. 
						

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INSP
ADJREAR SHOCK ABSORBER SPRING PRELOAD
ADJUSTMENT
REAR SHOCK ABSORBER SPRING 
PRELOAD ADJUSTMENT
1. Elevate the rear wheel by placing the
suitable stand under the engine.
2. Remove:
Rear frame
3. Loosen:
Locknut 1 
4. Adjust:
Spring preload
By turning the adjuster 2.
* For EUROPE, AUS, NZ and ZA
NOTE:
Be sure to remove all dirt and mud from
around the locknut and adjuster before
adjustment.
The length of the spring (installed) changes
1.5 mm (0.06 in) per turn of the adjuster.
CAUTION:
Never attempt to turn the adjuster beyond
the maximum or minimum setting.
5. Tighten:
Locknut
6. Install:
Rear frame (upper)
Rear frame (lower) Stiffer →Increase the spring preload.
(Turn the adjuster 2 in.)
Softer →Decrease the spring preload.
(Turn the adjuster 2 out.)
Spring length (installed) a:
Standard length Extent of adjustment
246 mm (9.69 in)
* 246.5 mm (9.70 in)240.5 ~ 258.5 mm
(9.47 ~ 10.18 in)
T R..32 Nm (3.2 m · kg, 23 ft · lb)
T R..29 Nm (2.9 m · kg, 21 ft · lb) 
						

							 
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INSP
ADJ
 
EC36N014 
REAR SHOCK ABSORBER REBOUND 
DAMPING FORCE ADJUSTMENT  
1. Adjust: 
 
Rebound damping force
By turning the adjuster   
1  
.  
Stiffer   
a  
   
→  
Increase the rebound damp-
ing force. (Turn the adjuster  
1  
 in.)
Softer   
b  
   
→  
Decrease the rebound damp-
ing force. (Turn the adjuster  
1  
 out.) 
Extent of adjustment:
Maximum Minimum
Fully turned in 
position20 clicks out 
(from maximum 
position) 
 
STANDARD POSITION:
This is the position which is back by the spe-
cific number of clicks from the fully turned-in
position. (Which align the punch mark   
a  
 on
the adjuster with the punch mark   
b  
 on the
bracket.)
* For EUROPE, AUS, NZ and ZA
CAUTION:
 
Do not force the adjuster past the minimum
or maximum extent of adjustment. The 
adjuster may be damaged. 
Standard position:
About 9 clicks out
*About 10 clicks out 
REAR SHOCK ABSORBER REBOUND DAMPING FORCE
ADJUSTMENT 
						

							 
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INSP
ADJ
 
REAR SHOCK ABSORBER LOW COMPRESSION
DAMPING FORCE ADJUSTMENT 
EC36c000 
REAR SHOCK ABSORBER LOW 
COMPRESSION DAMPING FORCE 
ADJUSTMENT  
1. Adjust: 
 
Low compression damping force
By turning the adjuster   
1  
.  
Stiffer   
a  
   
→  
Increase the low compres-
sion damping force. (Turn
the adjuster   
1  
 in.)
Softer   
b  
   
→  
Decrease the low compres-
sion damping force. (Turn
the adjuster   
1  
 out.) 
Extent of adjustment:
Maximum Minimum
Fully turned in 
position20 clicks out
(from maximum 
position) 
 
STANDARD POSITION:
This is the position which is back by the spe-
cific number of clicks from the fully turned-in
position. (Which align the punch mark   
a  
 on
the adjuster with the punch mark   
b  
 on the
high compression damping adjuster.)
* For EUROPE, AUS, NZ and ZA
CAUTION:
 
Do not force the adjuster past the minimum
or maximum extent of adjustment. The 
adjuster may be damaged. 
Standard position:
About 6 clicks out
*About 13 clicks out 
						

							 
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INSP
ADJ
 
EC36d000 
REAR SHOCK ABSORBER HIGH 
COMPRESSION DAMPING FORCE 
ADJUSTMENT  
1. Adjust: 
 
High compression damping force
By turning the adjuster   
1  
.  
Stiffer   
a  
   
→  
Increase the high compres-
sion damping force. (Turn
the adjuster   
1  
 in.)
Softer  
b  
   
→  
Decrease the high compres-
sion damping force. (Turn
the adjuster   
1  
 out.) 
Extent of adjustment:
Maximum Minimum
Fully turned in 
position2 turns out 
(from maximum 
position) 
 
STANDARD POSITION:
This is the position which is back by the spe-
cific number of turns from the fully turned-in
position. (Which align the punch mark  
a  
 on
the adjuster with the punch mark  
b  
 on the
adjuster body.)
* For EUROPE, AUS, NZ and ZA
CAUTION:
 
Do not force the adjuster past the minimum
or maximum extent of adjustment. The 
adjuster may be damaged. 
Standard position:
About 1-1/8 turns out
*About 1-1/3 turns out 
REAR SHOCK ABSORBER HIGH COMPRESSION
DAMPING FORCE ADJUSTMENT 
						

							 
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INSP
ADJ
 
TIRE PRESSURE CHECK/SPOKES INSPECTION AND
TIGHTENING/WHEEL INSPECTION 
EC36Q000 
TIRE PRESSURE CHECK 
1. Measure: 
 
Tire pressure
Out of specification  
→  
 Adjust.
NOTE:
 
 
Check the tire while it is cold. 
 
Loose bead stoppers allow the tire to slip off
its position on the rim when the tire pressure
is low. 
 
A tilted tire valve stem indicates that the tire
slips off its position on the rim. 
 
If the tire valve stem is found tilted, the tire is
considered to be slipping off its position. Cor- 
rect the tire position. 
Standard tire pressure:
100 kPa (1.0 kgf/cm 
2
 
, 15 psi) 
EC36S002 
SPOKES INSPECTION AND TIGHTENING 
1. Inspect: 
 
Spokes  
1 
 
Bend/damage 
 → 
 Replace.
Loose spoke  
→ 
 Retighten.
2. Tighten: 
 
Spokes
NOTE:
 
Be sure to retighten these spokes before and
after break-in. After a practice or a race check 
spokes for looseness.
T R..3 Nm (0.3 m · kg, 2.2 ft · lb)
 
EC36T000 
WHEEL INSPECTION 
1. Inspect: 
 
Wheel runout
Elevate the wheel and turn it.
Abnormal runout  
→ 
 Replace. 
						

							 
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INSP
ADJ
 
STEERING HEAD INSPECTION AND ADJUSTMENT 
2. Inspect: 
 
Bearing free play
Exist play  
→ 
 Replace. 
STEERING HEAD INSPECTION AND 
ADJUSTMENT 
1. Elevate the front wheel by placing a suit-
able stand under the engine.
2. Check: 
 
Steering shaft
Grasp the bottom of the forks and gen-
tly rock the fork assembly back and
forth.
Free play  
→ 
 Adjust steering head.
3. Check: 
 
Steering smooth action
Turn the handlebar lock to lock.
Unsmooth action  
→ 
 Adjust steering ring
nut. 
4. Adjust: 
 
Steering ring nut 
Steering ring nut adjustment steps: 
 
Remove the headlight. 
 
Remove the handlebar and handle crown. 

Loosen the ring nut 1 using the ring nut
wrench 2.
Ring nut wrench:
YU-33975/90890-01403