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

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
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.
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.
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INSP
ADJ