Yamaha YZ450FN 2022 Owner's Service Manual page 164

18.Install:
• Oil seal "1"
New
TIP
Using a fork seal driver "2", press the oil seal in
until the stopper ring groove fully appears.
Fork seal driver
90890-01502
Fork seal driver (48)
YM-A0948
19.Install:
• Stopper ring "1"
TIP
Fit the stopper ring correctly in the groove in the
outer tube.
20.Install:
• Dust seal "1"
New
TIP
Apply lithium-soap-based grease on the inner
tube.
21.Check:
• Inner tube smooth movement
Tightness/binding/rough spots  Repeat the
steps (14) to (20).
22.Measure:
• Distance "a"
Out of specification  Turn the locknut to
specification.
Distance "a"
16 mm (0.63 in) or more
Between the damper assembly
"1" bottom and locknut "2" bot-
tom.
4-50
FRONT FORK