Suzuki AN650 2002 Service Manual page 412

11-8 SERVICING INFORMATION
Complaint
Engine overheats.
Dirty or heavy
exhaust smoke.
Slipping clutch.
Dragging clutch.
Symptom and possible causes
Defective engine internal parts
1. Heavy carbon deposit on piston crowns.
2. Not enough oil in the engine.
3. Defective oil pump or clogged oil circuit.
4. Sucking air from intake pipes.
5. Use of incorrect engine oil.
6. Defective cooling system.
Lean fuel/air mixture
1. Short-circuited intake air pressure sensor/lead wire.
2. Short-circuited intake air temp. sensor/lead wire.
3. Sucking air from intake pipe joint.
4. Defective fuel injector.
5. Defective engine coolant temp. sensor.
The other factors
1. Ignition timing too advanced due to defective timing
advance system (engine coolant temp. sensor, gear
position switch, crankshaft position sensor and ECM.)
1. Too much engine oil in the engine.
2. Worn piston rings or cylinders.
3. Worn valve guides.
4. Scored or scuffed cylinder walls.
5. Worn valves stems.
6. Defective stem seal.
7. Worn oil ring side rails.
1. Weakened clutch springs.
2. Worn or distorted pressure plate.
3. Distorted clutch plates.
1. Some clutch spring weakened while others are not.
2. Distorted pressure plate or clutch plate.
Remedy
Clean.
Add oil.
Replace or clean.
Retighten or replace.
Change.
See radiator section.
Repair or replace.
Repair or replace.
Repair or replace.
Replace.
Replace.
Replace.
Check with inspection win-
dow. Drain excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.