Troubleshooting Of Steering/Handling - Yamaha YZ450F 2020 Owner's Service Manual

Symptom
Rear suspension is soft
Oil leaking from rear shock
absorber
EAM30515

TROUBLESHOOTING OF STEERING/HANDLING

Symptom
Handlebar wobble
Heavy steering
Possible cause
Oil leaking from rear shock
absorber
Gas leaking from rear shock
absorber
Fatigued or damaged rear shock
absorber spring
Improperly adjusted rear shock
absorber spring preload (soft)
Improperly adjusted rear shock
absorber rebound damping (soft)
Improperly adjusted rear shock
absorber compression damping
(soft)
Bent, damaged, or corroded rear
shock absorber rod
Damaged oil seal lip
Possible cause
Loose lower ring nut
Worn bearing or bearing race
Warped front fork
Bent front wheel axle
Incorrect tire pressure
Worn, deformed, or incorrect tire
Lower ring nut is tightened too
tight
Bent lower bracket
Broken bearing or bearing race
Incorrect tire pressure
9-10
TROUBLESHOOTING
Actions
Replace the rear shock absorber.
Replace the rear shock absorber.
Replace the rear shock absorber.
Adjust the spring preload.
Adjust the rebound damping.
Adjust the compression damping.
Replace the rear shock absorber.
Replace the rear shock absorber.
Actions
Tighten the lower ring nut to the
specified torque.
Replace the bearing and bearing
race as a set.
Repair or replace the front fork.
Replace the front wheel axle.
Adjust to the specified tire pres-
sure.
Replace the tire.
Tighten the lower ring nut to the
specified torque.
Replace the lower bracket.
Replace the bearing and bearing
race as a set.
Adjust to the specified tire pres-
sure.