Faulty Gear Shifting; Shift Lever Does Not Move; Jumps Out Of Gear; Faulty Clutch Performance - Yamaha Wolverine YX70EPNG Service Manual

EBS30326

FAULTY GEAR SHIFTING

Shifting is difficult
Refer to "FAULTY CLUTCH PERFORMANCE"
on page 10-4.
EBS30327

SHIFT LEVER DOES NOT MOVE

Shift drum and shift forks
• Foreign object in a shift drum groove
• Seized shift fork
• Bent shift fork guide bar
Transmission
• Seized transmission gear
• Foreign object between transmission gears
• Improperly assembled transmission
EBS30328

JUMPS OUT OF GEAR

Shift forks
• Worn shift fork
Shift drum
• Incorrect axial play
• Worn shift drum groove
Transmission
• Worn gear dog
EBS30329

FAULTY CLUTCH PERFORMANCE

Engine operates but vehicle will not move
1. V-belt
• Bent, damaged or worn V-belt
• Slipping V-belt
2. Primary sheave cam and primary sheave
slider
• Damaged or worn primary sheave cam
• Damaged or worn primary sheave slider
3. Clutch spring(s)
• Damaged clutch spring
4. Transmission gear(s)
• Damaged transmission gear
Clutch slips
1. Clutch spring(s)
• Damaged, loose or worn clutch spring
2. Clutch shoe(s)
• Damaged or worn clutch shoe
3. Primary sliding sheave
• Seized primary sliding sheave
TROUBLESHOOTING
Poor starting performance
1. V-belt
• V-belt slips
• Oil or grease on the V-belt
2. Primary and secondary sheaves
• Faulty operation
• Worn pin groove
• Worn pin
3. Clutch shoe
• Bent, damaged or worn clutch shoe
Poor speed performance
1. V-belt
• Oil or grease on the V-belt
2. Primary pulley weight(s)
• Faulty operation
• Worn primary pulley weight
3. Primary fixed sheave
• Worn primary fixed sheave
4. Primary sliding sheave
• Worn primary sliding sheave
5. Secondary fixed sheave
• Worn secondary fixed sheave
6. Secondary sliding sheave
• Worn secondary sliding sheave
EBS30330

OVERHEATING

Engine
1. Clogged coolant passages
2. Cylinder head and piston
• Heavy carbon buildup
3. Engine oil
• Incorrect oil level
• Incorrect oil viscosity
• Inferior oil quality
Cooling system
1. Coolant
• Low coolant level
2. Radiator
• Damaged or leaking radiator
• Faulty radiator cap
• Bent or damaged radiator fin
3. Water pump
• Damaged or faulty water pump
4. Thermostat
• Thermostat stays closed
5. Oil cooler
• Clogged or damaged oil cooler
6. Hose(s) and pipe(s)
• Damaged hose
• Improperly connected hose
10-4