Yamaha YZ450F 2021, Owner'S Service Manual

Page: 103 / 368

CHASSIS
3-27
EAM30247
CHECKING AND ADJUSTING THE
STEERING HEAD
1. Use a maintenance stand to raise the front
wheel off the ground.
WARNING
EWA13120
Securely support the vehicle so that there is
no danger of it falling over.
2. Check:
•
Steering head
Grasp the bottom of the front fork legs and
gently rock the front fork.
Blinding/looseness

Adjust the steering
head.
3. Remove:
•
Handlebar
Refer to “HANDLEBAR” on page 4-35.
•
Upper bracket
Refer to “STEERING HEAD” on page 4-55.
4. Adjust:
• Steering head
a. Remove the washer “1”.
b. After loosening the ring nut “2” with a
steering nut wrench “3”, tighten it to the
specified torque.
TIP
•
Set the torque wrench at a right angle to the
steering nut wrench.
•
Move the steering to the left and right a couple
of times to check that it moves smoothly.
c. Turn the front fork to the right and left a few
times, and make sure that the steering ro-
tates smoothly. If it does not turn smooth-
ly, remove the lower bracket and check
the upper and lower bearings.
Refer to “STEERING HEAD” on page
4-55.
d. Loosen the ring nut fully turn and then
tighten it to specification with a steering
nut wrench.
WARNING
EWA13140
Do not overtighten the lower ring nut.
e. Check the steering head for looseness or
binding by turning the front fork all the way
in both directions. If any binding is felt, re-
move the lower bracket and check the up-
per and lower bearings.
Refer to “STEERING HEAD” on page
4-55.
f. Install the washer “1”.
Drive chain puller locknut
21 N·m (2.1 kgf·m, 15 lb·ft)
T
R
.
.
1
Steering nut wrench
90890-01403
Exhaust flange nut wrench
YU-A9472
Ring nut (initial tightening torque)
38 N·m (3.8 kgf·m, 28 lb·ft)
Ring nut (final tightening torque)
7 N·m (0.7 kgf·m, 5.2 lb·ft)
3
2
T
R
.
.
T
R
.
.