Yamaha YZ450F Manuel D'atelier Du Proprietaire page 226

REAR 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
G
3. Loosen:
Locknut 1
G
4. Adjust:
Spring preload
G
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
249 mm (9.80 in)
*264 mm (10.39 in)
* For EUROPE
NOTE:
Be sure to remove all dirt and mud from
G
around the locknut and adjuster before
adjustment.
The length of the spring (installed) changes
G
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
G
6. Install:
Rear frame (upper)
G
Rear frame (lower)
G
3 - 37
INSP
ADJ
Extent of adjustment
240.5 ~ 258.5 mm
(9.47 ~ 10.18 in)
*255.5 ~ 273.5 mm
(10.06 ~ 10.77 in)
32 Nm (3.2 m · kg, 23 ft · lb)
29 Nm (2.9 m · kg, 21 ft · lb)