TROUBLESHOOTING
8-9
Front fork is soft
Fatigued or broken fork spring
Replace the fork spring.
Incorrect oil viscosity (low)
Change to recommended fork oil.
Incorrect oil level (low)
Adjust to the specified oil level.
Improperly adjusted spring pre-
load (soft)
Adjust the spring preload.
Improperly adjusted rebound
damping (soft)
Adjust the rebound damping.
Improperly adjusted compression
damping (soft)
Adjust the compression damping.
Leaking oil from front fork
Bent, damaged, or corroded inner
tube
Replace the inner tube.
Cracked or damaged outer tube
Replace the outer tube.
Improperly installed oil seal
Replace the oil seal.
Damaged oil seal lip
Replace the oil seal.
Incorrect oil level (high)
Adjust to the specified oil level.
Loose damper rod assembly bolt
Tighten the damper rod assembly
bolt to the specified torque.
Damaged damper rod assembly
bolt copper washer
Replace the damper rod assembly
bolt copper washer.
Cracked or damaged cap bolt O-
ring
Replace the cap bolt O-ring.
Rear suspension is hard
Bent or damaged rear shock
absorber rod
Replace the rear shock absorber.
Bent swingarm pivot shaft
Replace the swingarm pivot shaft.
Damaged or worn swingarm bear-
ing or bushing
Replace the swingarm bearing or
bushing.
Damaged or worn relay arm bear-
ing
Replace the relay arm bearing.
Damaged or worn connecting arm
bearing
Replace the connecting arm bear-
ing.
Improperly adjusted rear shock
absorber spring preload (hard)
Adjust the spring preload.
Improperly adjusted rear shock
absorber rebound damping (hard) Adjust the rebound damping.
Improperly adjusted rear shock
absorber compression damping
(hard)
Adjust the compression damping.
Symptom
Possible cause
Actions
Summary of Contents for YZ450FX 2023
Page 8: ......
Page 10: ...MOTORCYCLE CARE AND STORAGE 1 20 CARE 1 20 STORAGE 1 21 ...
Page 15: ...LOCATION OF IMPORTANT LABELS 1 5 ...
Page 16: ...LOCATION OF IMPORTANT LABELS 1 6 AUS NZL ZAF 4AA 22259 40 ...
Page 80: ...ELECTRICAL SYSTEM 3 32 ...
Page 96: ...HANDLEBAR 4 14 Throttle grip free play 3 0 6 0 mm 0 12 0 24 in ...
Page 116: ...CHAIN DRIVE 4 34 ...
Page 124: ...CLUTCH 5 7 ...
Page 128: ...FUEL TANK 6 3 ...
Page 148: ...SELF DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE 8 13 ...
Page 158: ...CHASSIS 9 9 ...
Page 160: ...PRINTED IN JAPAN E ...