Removing The Swingarm; Checking The Swingarm; Installing The Swingarm - Yamaha YZ 2020 Series Owner's Service Manual

EAM30071

REMOVING THE SWINGARM

1. Use a maintenance stand to raise the rear
wheel off the ground.
EWA13120
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
2. Measure:
• Swingarm side play
• Swingarm vertical movement
a. Measure the tightening torque of the pivot
shaft nut.
Pivot shaft nut
85 N·m (8.5 kgf·m, 63 lb·ft)
b. Measure the swingarm side play "a" by
moving the swingarm from side to side.
c. If the swingarm side play is out of specifi-
cation, check the bushings, the bearings,
and the collars.
d. Check the swingarm vertical movement
"b" by moving the swingarm up and down.
If swingarm vertical movement is not
smooth or if there is binding, check the
bushings, the bearings, and the collars.
Swingarm end free play limit (ra-
dial)
1.0 mm (0.04 in)
EAM30073

CHECKING THE SWINGARM

1. Check:
• Swingarm
Bends/cracks/damage  Replace.
2. Check:
• Pivot shaft
Roll the pivot shaft on a flat surface.
Bends  Replace.
EWA13770
WARNING
Do not attempt to straighten a bent pivot
shaft.
3. Wash with kerosene:
• Pivot shaft
• Bushing
• Collar
• Bearing
4. Check:
• Oil seal
Damage  Replace.
• Bearing
• Bushing
Free play exists/unsmooth revolution/rust 
Replace bearing and bushing as a set.
EAM30074

INSTALLING THE SWINGARM

1. Lubricate:
• Bearing
• Collar
• Bushing
• Oil seal
• Pivot shaft
b
2. Install:
• Bearing "1"
• Oil seal "2"
a
(to the swingarm)
TIP
First install the outer and then the inner bearings
to a specified depth from inside.
4-65
SWINGARM
Recommended lubricant
Molybdenum disulfide grease
New
Installed depth "a"
0–0.5 mm (0–0.02 in)
Installed depth "b"
6.5 mm (0.26 in)