SERVICING INFORMATION 7-3
Complaint Symptom and possible causes Remedy
Engine idles poorly. 1. Worn cylinder. Replace.
2. Worn piston rings. Replace.
3. Stiff piston ring. Replace.
4. Gas leaks from crankshaft oil seal. Replace.
5. Excessive spark plug gap. Adjust or replace.
6. Defective CDI/ignition coil unit. Replace.
7. Difective generator coil. Replace.
8. Incorrect float chamber fuel level. Adjust float height.
9. Clogged carburetor jet. Clean.
Engine runs poorly in 1. Worn cylinder. Replace.
high-speed range. 2. Worn piston rings. Replace.
3. Stiff piston ring. Replace.
4. Insufficient spark plug gap. Regap or replace.
5. Ignition not advanced sufficiently due to poorly working Replace.
CDI/ignition coil unit.
6. Defective generator coil. Replace.
7. Low float chamber fuel level. Adjust float height
8. Dirty air cleaner element. Clean.
9. Clogged fuel hose, resulting in inadequate fuel supply Clean and prime.
to the carburetor.
10. Clogged fuel valve. Clean.
Exhaust smoke is dirty or 1. Incorrect engine oil. Change.
thick.
Engine lacks power. 1. Worn cylinder. Replace.
2. Worn piston rings. Replace.
3. Stiff piston rings. Replace.
4. Gas leaks from crankshaft oil seal. Replace.
5. Insufficient spark plug gap. Regap or replace.
6. Clogged carburetor jet. Clean.
7. Incorrect float chamber fuel level. Adjust float height.
8. Clogged air cleaner element. Clean.
9. Fouled spark plug. Clean or replace.
10. Air leakage from intake pipe. Tighten or replace.
Engine overheats. 1. Carbon build-up on piston crown. Clean.
2. Defective oil pump or clogged oil circuit. Clean or replace.
3. Low float chamber fuel level. Adjust float height.
4. Air leakage from intake pipe. Tighten or replace.
5. Incorrect engine oil. Change.
6. Incorrect spark plug. Change.
7. Clogged exhaust pipe/muffler. Clean or replace.
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