Yamaha YZ450F Manuel D'atelier Du Proprietaire page 502

FRONT FORK
13. Check:
Inner tube smooth movement
G
Tightness/binding/rough spots →
Repeat the steps 2 to 12.
14. Compress the front fork fully.
15. Fill:
Front fork oil
G
Until outer tube top surface with recom-
mended fork oil 1.
Recommended oil:
Suspension oil "01"
CAUTION:
Be sure to use recommended fork oil. If
G
other oils are used, they may have an
excessively adverse effect on the front
fork performance.
Never allow foreign materials to enter the
G
front fork.
16. After filling, pump the damper rod 1
slowly up and down more than 10 times
to distribute the fork oil.
17. Fill:
Front fork oil
G
Until outer tube top surface with recom-
mended fork oil once more.
18. After filling, pump the outer tube 1 slowly
up and down (about 200 mm (7.9 in)
stroke) to distribute the fork oil once
more.
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 15 to 18.
5 - 34
CHAS