Instable Handling - Yamaha YQ50 Service Manual

FRONT FORK OIL LEAKAGE AND FRONT FORK
FRONT FORK OIL LEAKAGE AND FRONT FORK MALFUNCTION
OIL LEAKAGE
• Bent, damaged or rusty inner tube
• Damaged or cracked outer tube
• Damaged oil seal lip
• Improper installed oil seal
• Improper oil level (too much)
• Loose damper rod holding bolt
• Broken cap bolt O-ring

INSTABLE HANDLING

INSTABLE HANDLING
Handlebar
• Improperly installed or bent
Steering
• Improperly installed steering column
(Improperly tightened ring nut)
• Bent steering column
• Damaged ball bearing or bearing race
Front forks
• Broken spring
• Bended front forks
Tires
• Uneven tire pressures on both sides
• Incorrect tire pressure
• Unevenly worn tires
MALFUNCTION/
INSTABLE HANDLING
MALFUNCTION
• Bent, deformed or damaged inner tube
• Bent or deformed outer tube
• Damaged fork spring
• Worn or damaged slide metal
• Bent or damaged damper rod
• Improper oil viscosity
• Improper oil level
Wheels
• Damaged bearing
• Bent or loose wheel axle
• Excessive wheel run-out
Frame
• Twisted
• Damaged head pipe
• Improperly installed bearing race
Engine bracket
• Bent or damaged
Rear shock absorber
• Fatigued spring
• Oil leakage
9-6
TRBL
SHTG