Yamaha WR450F 2021, Owner'S Service Manual

Page: 118 / 402

CHASSIS
3-28
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
4-56.
f. Install the washer “1”.
5. Install:
• Upper bracket
Refer to “STEERING HEAD” on page 4-56.
• Handlebar
Refer to “HANDLEBAR” on page 4-37.
EAM30502
LUBRICATING THE STEERING HEAD
1. Lubricate:
•
Upper bearing
•
Lower bearing
•
Bearing race
EAM30338
CHECKING THE FRONT FORK LEGS
1. Stand the vehicle upright on a level surface.
WARNING
EWA13120
Securely support the vehicle so that there is
no danger of it falling over.
2. Check:
•
Inner tube
Damage/scratches

Replace.
•
Front fork leg
Oil leaks between inner tube and outer tube

Replace the oil seal.
3. Hold the vehicle upright and apply the front
brake.
4. Check:
• Front fork operation
Push down hard on the handlebar several
times and check if the front fork rebounds
smoothly.
Unsmooth operation

Correct or replace.
Refer to “FRONT FORK” on page 4-43.
5. Check:
•
Protector guide “1”
Out of specification

Replace.
TIP
The protector guide reaches the limit of its use
when it is worn down to the same height “a” as
of the outer tube circumference.
6. Remove:
• Protector
•
Dust seal “1”
NOTICE
ECA24330
Be careful not to damage the dust seal and
the inner tube by a driver.
7. Clean:
•
Dust seal “a”
• Scraper “b”
•
Oil seal “c”
TIP
• Clean the dust seal, scraper and oil seal after
every run.
• Apply lithium-soap-based grease on the inner
tube.
Ring nut (final tightening torque)
7 N·m (0.7 kgf·m, 5.2 lb·ft)
Recommended lubricant
Lithium-soap-based grease
T
R
.
.
1
1
a
1