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7-3 SERVICING INFORMATION
Complaint
Symptom and possible causes
Remedy
Engine runs poorly
1 _ Weakened valve springs.
Replace.
in high speed range.
2. Worn camshafts.
Replace.
3. Valve timing out of adjustment.
Adjust.
4. Too narrow spark plug gaps.
Adjust.
5. Ignition not advanced sufficiently due to poorly
Replace CDI unit.
working timing advance circuit.
6. Defective ignition coil.
Replace.
7. Defective generator or CDI unit.
Replace.
8. Too low float-chamber fuel level.
Adjust.
9. Clogged air cleaner element.
Clean.
10. Clogged fuel hose, resulting in inadequate fuel
Clean and prime.
supply to carburetor.
Dirty or heavy
1. Too much engine oil in the engine.
Check with inspection
exhaust smoke.
window drain out
excess oil.
2. Worn piston rings or cylinder.
Replace.
3. Worn valve guides.
Replace.
4. Scuffed cylinder wall.
Replace.
5. Worn valves stems.
Replace.
6. Defective stem seal.
Replace.
7. Worn oil ring side rails.
Replace.
Engine lacks power.
1. Loss of valve clearance.
Adjust.
2. Weakened valve springs.
Replace.
3. Out of adjustment valve timing.
Adjust.
4. Worn piston rings or cylinder.
Replace.
5. Poor seating of valves.
Repair.
6. Fouled spark plug.
Clean or replace.
7. Incorrect spark plug.
Adjust or replace.
8. Clogged jets in carburetor.
Clean.
9. Out of adjustment float-chamber fuel level.
Adjust.
10. Clogged air cleaner element.
Clean.
11. Sucking air from intake pipe.
Retighten or replace.
12. Too much engine oil.
Drain out excess oil.
13. Diffective generator, CDI unit or ignition coil.
Replace.
Engine overheats.
1. Heavy carbon deposit on piston crown.
Clean.
2. Not enough oil in the engine.
Add oil.
3. Defective oil pump or clogged oil circuit.
Replace or clean.
4. Too low in float chamber fuel level.
Adjust.
5. Sucking air from intake pipes.
Retighten or replace.
6. Use incorrect engine oil.
Change.
7. Oil cooler.
Clean.
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