Removing The Swingarm; Removing The Bearing; Checking The Swingarm; Installing The Swingarm - Yamaha YZ450FX 2019 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
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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 mov-
ing the swingarm from side to side.
c. If the swingarm side play is out of specifica-
tion, check the spacers, 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 spacers, the
bearings, and the collars.
Swingarm end free play limit (ra-
dial)
1.0 mm (0.04 in)
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EAM30072

REMOVING THE BEARING

1. Remove:
• Bearing "1"
TIP
Remove the bearing by pressing its outer race.
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
• Spacer
• Collar
• Bearing
4. Check:
• Oil seal
Damage  Replace.
• Bearing
• Spacer
Free play exists/unsmooth revolution/rust 
Replace bearing and bushing as a set.
EAM30074

INSTALLING THE SWINGARM

1. Lubricate:
• Bearing
• Collar
• Spacer
• Oil seal
New
4-62
SWINGARM