Lubricating The Steering Head; Checking The Front Fork Legs - Yamaha YZ 2020 Series Owner's Service Manual

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
4-54.
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
4-54.
f. Install the washer "1".
1
5. Install:
• Upper bracket
Refer to "STEERING HEAD" on page 4-54.
• Handlebar
Refer to "HANDLEBAR" on page 4-35.
EAM30502

LUBRICATING THE STEERING HEAD

1. Lubricate:
• Upper bearing
• Lower bearing
• Bearing race
Recommended lubricant
Lithium-soap-based grease
EAM30338

CHECKING THE FRONT FORK LEGS

1. Stand the vehicle upright on a level surface.
EWA13120
WARNING
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 4-41.
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.
3-27
CHASSIS