Faulty Front Fork Legs; Leaking Oil; Malfunction; Unstable Handling - Yamaha XT660R S Service Manual

EAS00861

FAULTY FRONT FORK LEGS

LEAKING OIL

• Bent, damaged or rusty inner tube
• Cracked or damaged outer tube
• Improperly installed oil seal
• Damaged oil seal lip
• Incorrect oil level (high)
• Loose damper rod assembly bolt
• Damaged damper rod assembly bolt copper
washer
• Cracked or damaged cap bolt O-ring
EAS00864

UNSTABLE HANDLING

Handlebar
• Bent or improperly installed handlebar
Steering head components
• Improperly installed upper bracket
• Improperly installed lower bracket
(improperly tightened ring nut)
• Bent steering stem
• Damaged ball bearing or bearing race
Front fork leg(s)
• Uneven oil levels (both front fork legs)
• Unevenly tensioned fork spring (both front
fork legs)
• Broken fork spring
• Bent or damaged inner tube
• Bent or damaged outer tube
Swingarm
• Worn bearing or bushing
• Bent or damaged swingarm
FAULTY FRONT FORK LEGS/
UNSTABLE HANDLING
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9 - 5

MALFUNCTION

• Bent or damaged inner tube
• Bent or damaged outer tube
• Damaged fork spring
• Worn or damaged outer tube bushing
• Bent or damaged damper rod
• Incorrect oil viscosity
• Incorrect oil level
Rear shock absorber assembly
• Faulty rear shock absorber spring
• Leaking oil or gas
Tire(s)
• Uneven tire pressures (front and rear)
• Incorrect tire pressure
• Uneven tire wear
Wheel(s)
• Incorrect wheel balance
• Broken or loose spoke
• Damaged wheel bearing
• Bent or loose wheel axle
• Excessive wheel runout
Frame
• Bent frame
• Damaged steering head pipe
• Improperly installed bearing race
TRBL
SHTG