Yamaha YZ450F 2021 - Troubleshooting of Steering;Handling

TROUBLESHOOTING
9-10
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 lower ring nut
Tighten the lower 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
Lower ring nut is tightened too
tight
Tighten the lower 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.
Symptom Possible cause Actions