Yamaha YZ125 2009, Owner'S Service Manual

Page: 75 / 234

3-22
CHASSIS
ADJUSTING THE REAR SHOCK
ABSORBER SPRING PRELOAD
1. Elevate the rear wheel by placing the suit-
able stand under the engine.
2. Remove:
• Rear frame
3. Measure:
• Spring fitting length
• The I.D. mark "a" is marked at the end of the
spring.
• Spring specification varies according to the
difference in the production lot.
4. Adjust:
• Spring preload
Adjustment steps:
a. Loosen the locknut "1".
b. Loosen the adjuster "2" until there is some
clearance between the spring and adjuster.
c. Measure the spring free length "a".
d. Turn the adjuster "2".
• Be sure to remove all dirt and mud from
around the locknut and adjuster before adjust-
ment.
• The length of the spring (installed) changes
1.5 mm (0.06 in) per turn of the adjuster.
Never attempt to turn the adjuster beyond
the maximum or minimum setting.
e. Tighten the locknut.
Standard fitting length:
I.D. MARK/ Q'TY Length
Red/1
Red/2
Red/3
258 mm (10.16 in)
*252 mm (9.92 in)
264 mm (10.39 in)
*258 mm (10.16 in)
255.5 mm (10.06 in)
*249.5 mm (9.82 in)
*For EUROPE
Stiffer
→
Increase the spring preload. (Turn
the adjuster "2" in.)
Softer
→
Decrease the spring preload.
(Turn the adjuster "2" out.)
Extent of adjustment:
Maximum Minimum
Position in which
the spring is turned
in 13 mm (0.51 in)
from its free length. Position in which
the spring is turned
in 1.5 mm (0.06 in)
from its free length.
Locknut:
30 Nm (3.0 m•kg, 22 ft•lb)