Yamaha 2001 YZ426F/LC Owner's Service Manual page 218

REAR SHOCK ABSORBER SPRING PRELOAD
ADJUSTMENT
EC36M013
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.
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
248 mm (9.76 in)
*262 mm (10.31 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.
CAUTION:
Never attempt to turn the adjuster beyond
the maximum or minimum setting.
5. Tighten:
Locknut
6. Install:
Rear frame
3 - 37
INSP
ADJ
Extent of adjustment
247 ~ 265 mm
(9.72 ~ 10.43 in)
*257 ~ 275 mm
(10.12 ~ 10.83 in)
29 Nm (2.9 m · kg, 21 ft · lb)