Yamaha YZ450FX 2021 Owner's Service Manual page 163

• Washer "2"
(to the outer tube)
TIP
Press the slide metal into the outer tube with fork
seal driver "3".
Fork seal driver
90890-01502
Fork seal driver (48)
YM-A0948
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:
• Scraper "1"
• Dust seal "2"
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 into the locknut.
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FRONT FORK