Unstable Handling; Lighting System; Headlight Does Not Come On; Tail/Brake Light Does Not Light - Yamaha YFZ450S 2003 Service Manual

EBS00552

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
EBS00553

LIGHTING SYSTEM

HEADLIGHT DOES NOT COME ON

• Improper bulb
• Too many electric accessories
• Hard charging (broken stator coil and/or
faulty rectifier/regulator)
• Incorrect connection
• Improperly grounded
• Poor contacts (main or light switch)
• Bulb life expired

TAIL/BRAKE LIGHT DOES NOT LIGHT

• Wrong tail/brake light bulb
• Too many electrical accessories
• Hard charging (broken stator coil and/or
faulty rectifier/regulator)
• Incorrect connection
• Improperly grounded
• Poor contacts (main or light switch)
• Burnt-out tail/brake light bulb
UNSTABLE HANDLING/
LIGHTING SYSTEM
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 light switch
• Bulb life expired

TAIL/BRAKE LIGHT BULB BURNT OUT

• Wrong tail/brake light bulb
• Faulty battery
• Faulty rectifier/regulator
• Improperly grounded
• Faulty main and/or light switch
• Incorrectly adjusted rear brake light switch
• Tail/brake light bulb life expired
9 - 5
TRBL
SHTG