Yamaha YZ125X 2023, Owner'S Manual

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TROUBLESHOOTING
7-11
EAM30515
TROUBLESHOOTING OF STEERING/HANDLING
Rear suspension is soft
Oil leaking from rear shock
absorber
Replace the rear shock absorber.
Gas leaking from rear shock
absorber
Replace the rear shock absorber.
Fatigued or damaged rear shock
absorber spring
Replace the rear shock absorber.
Improperly adjusted rear shock
absorber spring preload (soft)
Adjust the spring preload.
Improperly adjusted rear shock
absorber rebound damping (soft)
Adjust the rebound damping.
Improperly adjusted rear shock
absorber compression damping
(soft)
Adjust the compression damping.
Oil leaking from rear shock
absorber
Bent, damaged, or corroded rear
shock absorber rod
Replace the rear shock absorber.
Damaged oil seal lip Replace the rear shock absorber.
Symptom Possible cause Actions
Handlebar wobble
Loose steering ring nut
Tighten the steering ring nut to the
specified torque.
Worn bearing or bearing race
Replace the bearing and bearing
race as a set.
Warped front fork Repair or replace the front fork.
Bent front wheel axle Replace the front wheel axle.
Incorrect tire pressure
Adjust to the specified tire pres-
sure.
Worn, deformed, or incorrect tire Replace the tire.
Heavy steering
Steering ring nut is tightened too
tight.
Tighten the steering ring nut to the
specified torque.
Bent lower bracket Replace the lower bracket.
Broken bearing or bearing race
Replace the bearing and bearing
race as a set.
Incorrect tire pressure
Adjust to the specified tire pres-
sure.
Front wheel vibration
Loose spoke
Tighten the spoke and adjust the
runout.
Damaged or worn wheel bearing Replace the wheel bearing.
Worn, deformed, or incorrect tire Replace the tire.
Loose wheel axle or wheel axle
nut
Tighten the wheel axle or wheel
axle nut to the specified torque.
Loose wheel axle pinch bolt
Tighten the wheel axle pinch bolt
to the specified torque.
Incorrect front fork oil level
Adjust to the specified front fork oil
level.
Symptom Possible cause Actions