Yamaha YZ450F(D) Owner's Service Manual page 161

25. Install:
• Damper assembly "1"
To inner tube "2".
To install the damper assembly
into the inner tube, hold the inner
tube aslant. If the inner tube is held
vertically, the damper assembly
may fall into it, damaging the valve
inside.
26. Loosen:
• Rebound damping adjuster "1"
• Loosen the rebound damping ad-
juster finger tight.
• Record the set position of the ad-
juster (the amount of turning out the
fully turned in position).
27. Install:
• Push rod "1"
• Copper washer "2"
• Adjuster "3"
To damper assembly "4".
• While compressing the inner tube
"5", set the cap bolt ring wrench "7"
between the inner tube and locknut
"6".
• Fully finger tighten the adjuster onto
the damper assembly.
Cap bolt ring wrench:
YM-01501/90890-01501
28. Inspect:
• Gap "a" between the adjuster "1"
and locknut "2".
Out of specification → Retighten
and readjust the locknut.
Gap "a" between the ad-
juster and locknut:
0.5–1.0 mm (0.02–0.04
in)
If the adjuster is installed out of spec-
ification, proper damping force can-
not be obtained.
29. Tighten:
• Adjuster (locknut) "1"
Adjuster (locknut):
29 Nm (2.9 m•kg, 21
ft•lb)
Hold the locknut "2" and tighten the
adjuster with specified torque.
30. Install:
• Adjuster "1"
Adjuster:
55 Nm (5.5 m•kg, 40
ft•lb)
To inner tube.
5-22
FRONT FORK
31. Fill:
• Front fork oil "1"
From outer tube top.
Recommended oil:
Suspension oil "S1"
Standard oil amount:
3
355 cm (12.5 Imp oz,
12.0 US oz)
Extent of adjustment:
3
300–365 cm
(10.6–12.8 Imp
oz,10.1–12.3 US oz)
Never fail to make the oil amount
adjustment between the maximum
and minimum amount and always
adjust each front fork to the same
setting. Uneven adjustment can
cause poor handling and loss of
stability.
• Be sure to use recommended
fork oil. If other oils are used,
they may have an excessively ad-
verse effect on the front fork per-
formance.
• Never allow foreign materials to
enter the front fork.
32. Install:
• Damper assembly "1"
To outer tube.
Temporarily tighten the damper as-
sembly.