Faulty Clutch; Engine Operates But Vehicle Will Not Move; Poor Starting Performance; Poor Speed Performance - Yamaha Raptor 90 YFM90RA 2011 Service Manual

FAULTY GEAR SHIFTING/CLUTCH SLIPPING/
EAS00853

FAULTY CLUTCH

ENGINE OPERATES BUT VEHICLE WILL
NOT MOVE
V-belt
• Bent, damaged or worn V-belt
• Slipping V-belt
Primary pulley cam and primary pulley slider
• Damaged or worn primary pulley cam
• Damaged or worn primary pulley slider
Clutch spring(s)
• Damaged clutch spring
Transmission gears
• Damaged transmission gear
CLUTCH SLIPPING
Clutch shoe springs
• Damaged, loose or worn clutch shoe
spring
Clutch shoes
• Damaged or worn clutch shoe
Primary sliding sheave
• Seized primary sliding sheave
EBS00546

OVERHEATING

OVERHEATING
Ignition system
• Improper spark plug gap
• Improper spark plug heat range
• Faulty C.D.I. unit
Fuel system
• Improper carburetor main jet (improper set-
ting)
• Improper fuel level
• Clogged air filter element
DRAGGING/OVERHEATING

POOR STARTING PERFORMANCE

V-belt
• V-belt slips
• Oil or grease on the V-belt
Primary sliding sheave
• Faulty operation
• Worn pin groove
• Worn pin
Clutch shoes
• Bent, damaged or worn clutch shoe

POOR SPEED PERFORMANCE

V-belt
• Oil or grease on the V-belt
Primary pulley weight(s)
• Faulty operation
• Worn primary pulley weight
Primary fixed sheave
Worn primary fixed sheave
•
Primary sliding sheave
Worn primary sliding sheave
•
Secondary fixed sheave
Seized primary sliding sheave
•
Secondary sliding sheave
Worn secondary sliding sheave
•
Compression system
• Heavy carbon build-up
Engine oil
• Improper oil level
• Improper oil viscosity
• Inferior oil quality
Brake
• Brake drag
8 - 3
TRBL
SHTG