Yamaha YZ450F(S) Owner's Service Manual page 232

STEERING HEAD INSPECTION AND ADJUSTMENT
B 0
C
9
8
7
6
Tighten the ring nut 3 using ring nut
G
wrench 4.
NOTE:
Apply the lithium soap base grease on the
G
thread of the steering shaft.
Set the torque wrench to the ring nut
G
wrench so that they form a right angle.
Ring nut wrench:
YU-33975/90890-01403
Ring nut (initial tightening):
38 Nm (3.8 m • kg, 27 ft • lb)
Loosen the ring nut one turn.
G
Retighten the ring nut using the ring nut
G
wrench.
WARNING
Avoid over-tightening.
Ring nut (final tightening):
7 Nm (0.7 m • kg, 5.1 ft • lb)
Check the steering shaft by turning it lock
G
to lock. If there is any binding, remove the
steering shaft assembly and inspect the
steering bearings.
Install the plain washer 5, handle crown
G
6, plain washer 7, steering shaft nut 8,
steering shaft cap 9, handlebar 0, han-
dlebar holder A and number plate B.
NOTE:
The upper handlebar holder should be
G
installed with the punched mark a forward.
Insert the end of fuel breather hose C into
G
the hole in the steering shaft cap.
CAUTION:
First tighten the bolts on the front side of
the handlebar holder, and then tighten
the bolts on the rear side.
Steering shaft nut:
145 Nm (14.5 m • kg, 105 ft • lb)
Handlebar upper holder:
28 Nm (2.8 m • kg, 20 ft • lb)
Pinch bolt (handle crown):
23 Nm (2.3 m • kg, 17 ft • lb)
Number plate:
7 Nm (0.7 m • kg, 5.1 ft • lb)
3 - 43
INSP
ADJ