Yamaha YZ450F, Owner'S Service Manual

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INSP
ADJ
STEERING HEAD INSPECTION AND ADJUSTMENT
• Tighten the ring nut
3
using ring nut
wrench
4
.
NOTE:
• Apply the lithium soap base grease on the
thread of the steering shaft.
• Set the torque wrench to the ring nut
wrench so that they form a right angle.
Ring nut wrench:
YU-33975/90890-01403
T
R
.
.
Ring nut (initial tightening):
38 Nm (3.8 m • kg, 27 ft • lb)
• Loosen the ring nut one turn.
• Retighten the ring nut using the ring nut
wrench.
WARNING
Avoid over-tightening.
T
R
.
.
Ring nut (final tightening):
7 Nm (0.7 m • kg, 5.1 ft • lb)
• Check the steering shaft by turning it lock
to lock. If there is any binding, remove the
steering shaft assembly and inspect the
steering bearings.
• Install the plain washer
5
, handle crown
6
, plain washer
7
, steering shaft nut
8
,
handlebar
9
, handlebar holder (upper)
0
and number plate
A
.
NOTE:
• The handlebar holder (upper) should be
installed with the punched mark
a
for-
ward.
• Install the handlebar so that the marks
b
are in place on both sides.
• Install the handlebar so that the projection
c
of the handlebar holder (upper) is posi-
tioned at the mark on the handlebar as
shown.
• Insert the end of fuel breather hose
B
into
the hole in the steering shaft.
CAUTION:
First tighten the bolts on the front side of
the handlebar holder (upper), and then
tighten the bolts on the rear side.