Poor Medium-And-High-Speed Performance; Faulty Clutch; Overheating - Yamaha 2007 XP500 Service Manual

2. Spark plug(s)
Incorrect spark plug gap
G
Incorrect spark plug heat range
G
Fouled spark plug
G
Worn or damaged electrode
G
Worn or damaged insulator
G
Faulty spark plug cap
G
3. Ignition coil(s)
Faulty spark plug lead
G
4. Ignition system
Faulty ECU (engine)
G
Faulty crankshaft position sensor
G
EAS28510
POOR MEDIUM-AND-HIGH-SPEED
PERFORMANCE
Refer to "STARTING FAILURE/HARD START-
ING" on page 9-1.
Engine
1. Air filter
Clogged air filter element
G
Fuel system
1. Fuel pump
Faulty fuel pump
G
EAS28580

FAULTY CLUTCH

Engine operates but vehicle will not move
1. V-belt
Bent, damaged or worn V-belt
G
Slipping V-belt
G
2. Primary pulley cam and primary pulley slider
Damaged or worn primary pulley cam
G
Damaged or worn primary pulley slider
G
3. Clutch spring(s)
Damaged clutch spring
G
4. Transmission gear(s)
Damaged transmission gear
G
Clutch slips
1. Clutch shoe spring(s)
Damaged, loose or worn clutch shoe spring
G
2. Clutch shoe(s)
Damaged or worn clutch shoe
G
3. Primary sliding sheave
Seized primary sliding sheave
G
Poor starting performance
1. V-belt
V-belt slips
G
Oil or grease on the V-belt
G
2. Primary sliding sheave
Faulty operation
G
Worn pin groove
G
Worn pin
G
3. Clutch shoe(s)
TROUBLESHOOTING
Bent, damaged or worn clutch shoe
G
Poor speed performance
1. V-belt
Oil or grease on the V-belt
G
2. Primary pulley weight(s)
Faulty operation
G
Worn primary pulley weight
G
3. Primary fixed sheave
Worn primary fixed sheave
G
4. Primary sliding sheave
Worn primary sliding sheave
G
5. Secondary fixed sheave
Worn secondary fixed sheave
G
6. Secondary sliding sheave
Worn secondary sliding sheave
G
EAS28600

OVERHEATING

Engine
1. Clogged coolant passages
Cylinder head(s) and piston(s)
G
Heavy carbon buildup
G
2. Engine oil
Incorrect oil level
G
Incorrect oil viscosity
G
Inferior oil quality
G
Cooling system
1. Coolant
Low coolant level
G
2. Radiator
Damaged or leaking radiator
G
Faulty radiator cap
G
Bent or damaged radiator fin
G
3. Water pump
Damaged or faulty water pump
G
Thermostat
G
Thermostat stays closed
G
Oil cooler
G
Clogged or damaged oil cooler
G
Hose(s) and pipe(s)
G
Damaged hose
G
Improperly connected hose
G
Damaged pipe
G
Improperly connected pipe
G
Fuel system
1. Throttle body
Damaged or loose throttle body joint
G
2. Air filter
Clogged air filter element
G
Chassis
1. Brake(s)
Dragging brake
G
Electrical system
1. Spark plug(s)
9-2