Yamaha YZ450F(T) Owner's Service Manual page 502

FRONT FORK
4. After filling, pump the damper assembly 1
slowly up and down (about 200 mm (7.9 in)
stroke) several times to bleed the damper
assembly of air.
NOTE:
Be careful not to excessive full stroke. A stroke
of 200 mm (7.9 in) or more will cause air to
enter. In this case, repeat the steps 2 to 4.
5. Inspect:
• Oil amount
While keeping the damper assembly fully
stretched, check that the oil is above the
step a on the damper assembly.
Below the step → Replenish fork oil
above the step.
6. Tighten:
• Locknut 1
NOTE:
Fully finger tighten the locknut onto the
damper assembly.
7. Loosen:
• Compression damping adjuster 1
NOTE:
• Loosen the compression damping adjuster
finger tight.
• Record the set position of the adjuster (the
amount of turning out the fully turned in posi-
tion).
8. Install:
• Base valve 1
To damper assembly 2.
NOTE:
First bring the damper rod pressure to a maxi-
mum. Then install the base valve while releas-
ing the damper rod pressure.
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CHAS