Yamaha Wr 450 F Owners Manual

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TUNSETTING
EC727020
Spring preload adjustment
The spring preload is adjusted by installing the
adjustment washer 1 between the fork spring
2 and damper rod 3.
CAUTION:
Do not install three or more adjustment
washers for each front fork.
WARNING
Always adjust each front fork to the same
setting. Uneven adjustment can cause poor
handling and loss of stability.
ÅLoad
ıFork stroke
1Without adjustment washer (standard)
21 adjustment washer
32 adjustment washers
Standard washer quantity:
Zero adjustment...

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TUN
2. Use of stiff spring
Generally a stiff spring gives a stiff riding
feeling. Rebound damping tends to
become weaker, resulting in lack of a
sense of contact with the road surface or
in a vibrating handlebar.
To set a stiff spring:
Change the rebound damping.
Turn in one or two clicks.
Change the compression damping.
Turn out one or two clicks.
ÅCoverage of spring by weight
ıRider weight
1Soft
2Standard
3Stiff
SETTING 

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TUN
EC72P000
Front fork setting parts
Adjustment washer 1 
Front fork spring 2 
[Equal pitch spring]
* For EUROPE
** For AUS, NZ and ZA
[Unequal pitch spring]
NOTE:
The unequal pitch spring is softer in initial
characteristic than the equal pitch spring and
is difficult to bottom out under full compres-
sion.
The I.D. mark (slits) a is proved on the end
of the spring.TYPE (thickness) PART NUMBER
T = 2.3 mm (0.09 in) 4SS-23364-L0
TYPESPRING 
RATESPRING
PART NUMBERI.D. 
MARK 
(slits)
SOFT0.380...

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EC72B000
Rear suspension setting
The rear suspension setting should be made
depending on the rider’s feeling of an actual
run and the circuit conditions.
The rear suspension setting includes the fol-
lowing two factors:
1. Setting of spring preload
Change the set length of the spring.
Change the spring.
2. Setting of damping force
Change the rebound damping.
Change the compression damping.
EC72C001
Choosing set length
1. Place a stand or block under the engine
to put the rear wheel above...

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TUNSETTING
NOTE:
If the machine is new and after it is broken in,
the same set length of the spring may
change because of the initial fatigue, etc. of
the spring. Therefore, be sure to make re-
evaluation.
If the standard figure cannot be achieved by
adjusting the spring adjuster and changing
the spring set length, replace the spring with
an optional one and make re-adjustment.
EC72G001
Setting of spring after replacement
After replacement, be sure to adjust the spring
to the set length [sunken...

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CAUTION:
When using a rear cushion other than cur-
rently installed, use the one whose overall
length a does not exceed the standard as
it may result in faulty performance. Never
use one whose overall length is greater
than standard.
ÅCoverage of spring by weight
ıRider weight 
1Soft
2Standard
3Stiff
Length a of standard shock:
490.5 mm (19.31 in)
SETTING 

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TUNSETTING
EC72Q000
Rear shock absorber setting parts
Rear shock spring 1 
[Equal pitch spring]
* For EUROPE
** For AUS, NZ and ZA
[Unequal pitch spring]
NOTE:
The unequal pitch spring is softer in initial
characteristic than the equal pitch spring and
is difficult to bottom out under full compres-
sion.
The I.D. color a is marked at the end of the
spring.
Extent of adjustment (spring length)
TYPESPRING 
RATESPRING
PART NUMBERI.D. 
COLOR/
POINTSPRING 
FREE 
LENGTH
SOFT4.3
4.5
4.75UN-22212-00...

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TUNSETTING
EC72H002
Suspension setting
Front fork
NOTE:
If any of the following symptoms is experienced with the standard position as the base, make
resetting by reference to the adjustment procedure given in the same chart.
Before any change, set the rear shock absorber sunken length to the standard figure 90 ~
100 mm (3.5 ~ 3.9 in).
SymptomSection
Check Adjust
JumpLarge 
gapMedium 
gapSmall 
gap
Stiff over entire range

Compression damping
Oil level (oil amount)
SpringTurn adjuster...

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TUNSETTING
Rear shock absorber
NOTE:
If any of the following symptoms is experienced with the standard position as the base, make
resetting by reference to the adjustment procedure given in the same chart.
Adjust the rebound damping in 2-click increments or decrements.
Adjust the low compression damping in 1-click increments or decrements.
Adjust the high compression damping in 1/6 turn increments or decrements.
SymptomSection
Check Adjust
JumpLarge 
gapMedium 
gapSmall 
gap
Stiff, tending to...

PRINTED IN JAPAN
2002.10-2.0×1 CR
(E) PRINTED ON RECYCLED PAPER YAMAHA MOTOR CO., LTD.
2500 SHINGAI IWATA SHIZUOKA JAPAN