Faulty Clutch; Clutch Slips; Clutch Drags; Overheating - Yamaha YZ85W1 Service Manual

EAS00851

FAULTY CLUTCH

CLUTCH SLIPS

Clutch
• Improperly assembled clutch
• Improperly adjusted clutch cable
• Loose or fatigued clutch spring
• Worn friction plate
• Worn clutch plate
Transmission oil
• Incorrect oil level
• Incorrect oil viscosity (low)
• Deteriorated oil
EAS00855

OVERHEATING

ENGINE

Clogged coolant passages
• Cylinder head(s) and piston(s)
• Heavy carbon buildup
Transmission oil
• Incorrect oil level
• Incorrect oil viscosity
• Inferior oil quality

COOLING SYSTEM

Coolant
• Low coolant level
Radiator
• Damaged or leaking radiator
• Faulty radiator cap
• Bent or damaged radiator fin
Water pump
• Damaged or faulty water pump
• Hose(s) and pipe(s)
• Damaged hose
• Improperly connected hose
• Damaged pipe
• Improperly connected pipe
FAULTY CLUTCH / OVERHEATING

CLUTCH DRAGS

Clutch
Transmission oil

FUEL SYSTEM

Carburetor(s)
Air filter

CHASSIS

Brake(s)

ELECTRICAL SYSTEMS

Spark plug(s)
Ignition system
10-3
• Unevenly tensioned clutch springs
• Warped pressure plate
• Bent clutch plate
• Swollen friction plate
• Bent clutch push rod
• Broken clutch boss
• Burnt primary driven gear bushing
• Match marks not aligned
• Incorrect oil level
• Incorrect oil viscosity (high)
• Deteriorated oil
• Incorrect main jet setting
• Incorrect fuel level
• Damaged or loose carburetor joint
• Clogged air filter element
• Dragging brake
• Incorrect spark plug gap
• Incorrect spark plug heat range
• Faulty CDI unit
TRBL
SHTG