Yamaha YZ125 2022 Owner's Service Manual page 257

Symptom
Rear wheel vibration
Possible cause
Loose spoke
Damaged or worn wheel bearing
Worn, deformed, or incorrect tire
Loose wheel axle nut
Loose swingarm pivot shaft
Bent or damaged swingarm
Damaged or worn swingarm bear-
ing or bushing
9-12
TROUBLESHOOTING
Actions
Tighten the spoke and adjust the
runout.
Replace the wheel bearing.
Replace the tire.
Tighten the wheel axle nut to the
specified torque.
Tighten the swingarm pivot shaft
to the specified torque.
Replace the swingarm bearing.
Replace the swingarm bearing or
bushing.