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SERVICING INFORMATION 10-11
Complaint Symptom and possible causes Remedy
Engine overheats 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 incorrect engine oil
6. Defective cooling system
Lean fuel/air mixture
1. Short-circuited IAP sensor/lead wire
2. Short-circuited IAT sensor/lead wire
3. Sucking air from intake pipe joint
4. Defective fuel injectors
5. Defective ECT sensor
Other factors
1. Ignition timing is too advanced due to defective
timing advance system (ECT sensor, GP sensor,
CKP sensor and ECM).
2. Drive chain is too tight.
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.
Adjust.
Dirty or heavy
exhaust smoke
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
Check with inspection
window, drain out excess
oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Slipping clutch 1. Weakened clutch springs
2. Worn or distorted pressure plates
3. Distorted clutch plates or pressure plates
Replace.
Replace.
Replace.
Dragging clutch 1. Some clutch spring weakened while others
are not.
2. Distorted pressure plates or clutch plates
Replace.
Replace.
Transmission will
not shift.
1. Broken gearshift cam
2. Distorted gearshift forks
3. Worn gearshift pawl
Replace.
Replace.
Replace.
Transmission will
not shift back.
1. Broken return spring on shift shaft
2. Rubbing or stickily shift shaft
3. Distorted or worn gearshift forks
Replace.
Repair or replace.
Replace.
Transmission jumps
out of gear.
1. Worn shifting gears on driveshaft or
countershaft
2. Distorted or worn gearshift forks
3. Weakened stopper spring on gearshift stopper
4. Worn gearshift cam plate
Replace.
Replace.
Replace.
Replace.