Yamaha YFZ450RF Owner's Manual page 41

TIP
 A special wrench can be obtained at a Yamaha
dealer to make this adjustment.
 The spring preload setting is determined by
measuring distance A, shown in the illustration.
The shorter distance A is, the higher the spring
preload; the longer distance A is, the lower the
spring preload. With each complete turn of the
adjusting nut, distance A is changed by 1.5 mm
(0.06 in).
Spring preload setting:
Minimum (soft):
Distance A = 302.5 mm (11.91 in)
Standard:
Distance A = 293.0 mm (11.54 in)
Maximum (hard):
Distance A = 282.5 mm (11.12 in)
1
1. Distance A
3. Tighten the locknut to the specified torque.
NOTICE: Always tighten the locknut
against the adjusting nut, and then tighten
it to the specified torque.
Tightening torque:
Locknut:
50 Nm (5.0 m·kgf, 36 ft·lbf)
4-13
4
[ECB00082]