Checking And Adjusting The Steering Head; Lubricating The Steering Head - Yamaha YZ450FN 2022 Owner's Service Manual

EAM30247
CHECKING AND ADJUSTING THE
STEERING HEAD
1. Use a maintenance stand to raise the front
wheel off the ground.
EWA13120
WARNING
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".
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.
3
2
3-27
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)
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.
EWA13140
WARNING
Do not overtighten the lower ring nut.
Ring nut (final tightening torque)
7 N·m (0.7 kgf·m, 5.2 lb·ft)
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".
1
5. Install:
• Upper bracket
Refer to "STEERING HEAD" on page 4-55.
• Handlebar
Refer to "HANDLEBAR" on page 4-35.
EAM30502

LUBRICATING THE STEERING HEAD

1. Lubricate:
• Upper bearing
CHASSIS