Yamaha YFM400FWA 2000 5GH3-AE1 Service Manual page 380

UNSTABLE HANDLING/LIGHTING SYSTEM
SHOCK ABSORBER MALFUNCTION
MALFUNCTION
Bent or damaged damper rod
Damaged oil seal lip
Fatigued shock absorber spring
UNSTABLE HANDLING
UNSTABLE HANDLING
Handlebar
Improperly installed or bent
Steering
Incorrect toe-in
Bent steering stem
Improperly installed steering stem
Damaged bearing or bearing race
Bent tie rods
Deformed steering knuckles
Tires
Uneven tire pressures on both sides
Incorrect tire pressure
Uneven tire wear
LIGHTING SYSTEM
HEADLIGHT DARK
Improper bulb
Too many electric accessories
Hard charging (broken charging coil and/
or faulty rectifier/regulator)
Incorrect connection
Improperly grounded
Poor contacts (main or lights switch)
Bulb life expired
SHOCK ABSORBER MALFUNCTION/
10 - 6
Wheels
Deformed wheel
Loose bearing
Bent or loose wheel axle
Excessive wheel runout
Frame
Bent
Damaged frame
Swingarm
Worn bearing or bushing
Bent or damaged
BULB BURNT OUT
Improper bulb
Faulty battery
Faulty rectifier/regulator
Improperly grounded
Faulty main and/or lights switch
Bulb life expired
TRBL
SHTG