Yamaha WR450F(V) Owner's Service Manual page 594

FRONT FORK
13. Check:
• Inner tube smooth movement
Tightness/binding/rough spots → Repeat
the steps 2 to 12.
14. Compress the front fork fully.
15. Fill:
• Front fork oil
Until outer tube top surface with recom-
mended fork oil 1.
Recommended oil:
Suspension oil "S1"
CAUTION:
• Be sure to use recommended fork oil. If
other oils are used, they may have an
excessively adverse effect on the front
fork performance.
• Never allow foreign materials to enter the
front fork.
16. After filling, pump the damper rod 1 slowly
up and down more than 10 times to distrib-
ute the fork oil.
17. Fill:
• Front fork oil
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