Yamaha YZ450FX 2023, Owner'S Manual

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FRONT FORK
4-16
3. Remove:
•
Dust seal “1”
• Stopper ring “2”
(with a flat-head screwdriver)
NOTICE
ECA14180
Do not scratch the inner tube.
4. Remove:
• Inner tube “1”
a. Push in slowly “a” the inner tube just be-
fore it bottoms out and then pull it back
quickly “b”.
b. Repeat this step until the inner tube can be
pulled out from the outer tube.
5. Remove:
•
Base valve “1”
(from the damper assembly)
TIP
Hold the damper assembly with the cap bolt ring
wrench “2” and use the cap bolt wrench “3” to re-
move the base valve.
EAM30057
CHECKING THE FRONT FORK LEGS
1. Check:
• Inner tube surface
Scratches

Repair or replace.
Use #1000 grit wet sandpaper.
Damaged oil lock piece

Replace.
• Inner tube bends
Out of specification

Replace.
Use the dial gauge.
TIP
The bending value is shown by one half of the
dial gauge reading.
WARNING
EWA13650
Do not attempt to straighten a bent inner
tube as this may dangerously weaken it.
2. Check:
•
Outer tube
Scratches/wear/damage

Replace.
3. Measure:
• Fork spring free length “a”
Out of specification

Replace.
1
2
3
4
1
2
Cap bolt wrench
90890-01500
Cap bolt wrench
YM-01500
Cap bolt ring wrench
90890-01501
Cap bolt ring wrench
YM-01501
Inner tube bending limit
0.2 mm (0.01 in)
Fork spring free length limit
492.0 mm (19.37 in)
1
2
3