Yamaha YZ450FX 2023, Owner'S Manual

Page: 72 / 164

CHASSIS
3-24
5. Install:
•
Upper bracket
• Handlebar
Refer to “HANDLEBAR” on page 4-10.
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 4-15.
TIP
If any damage is found or the front fork does not
operate smoothly, have a Yamaha dealer check
or repair it.
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.
Recommended lubricant
Lithium-soap-based grease
1
1
a
1
LS
a
b
c