Yamaha YZ450F(V) Owner's Service Manual page 220

REAR SHOCK ABSORBER SPRING PRELOAD
b
ADJUSTMENT
REAR SHOCK ABSORBER SPRING
PRELOAD ADJUSTMENT
1. Elevate the rear wheel by placing the suit-
able stand under the engine.
2. Remove:
• Rear frame
3. Loosen:
• Locknut 1
4. Adjust:
• Spring preload
By turning the adjuster 2.
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
One I.D. mark
264 mm (10.39 in)
*262 mm (10.31 in)
Two I.D. marks
270 mm (10.63 in)
*268 mm (10.55 in)
Three I.D. marks
261.5 mm (10.30 in)
*259.5 mm (10.22 in)
* For EUROPE
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.
• The I.D. mark b is marked at the end of the
spring.
• The standard length and extent of adjust-
ment vary according to the quantity of I.D.
marks.
CAUTION:
Never attempt to turn the adjuster beyond
the maximum or minimum setting.
3 - 37
INSP
ADJ
Extent of adjustment
255.5 ~ 273.5 mm
(10.06 ~ 10.77 in)
261.5 ~ 279.5 mm
(10.30 ~ 11.00 in)
253.0 ~ 271.0 mm
(9.96 ~ 10.67 in)