9-2 SERVICING INFORMATION
TROUBLESHOOTING
ENGINE
Complaint Symptom and possible causes Remedy
Engine will not start
or is hard to start.
Compression too low
1. Worn cylinder.
2. Worn piston ring.
3. Worn valve guide or improper valve seating.
4. Loose spark plug.
5. Broken, cracked, or damaged piston.
6. Slow cranking starter motor.
7. Mistimed valves.
8. Valve clearance out of adjustment.
Spark plug not sparking
1. Damaged spark plug.
2. Damaged spark plug cap.
3. Fouled spark plug.
4. Wet spark plug.
5. Defective ignition coil.
6. Open or short in high-tension cord.
7. Defective pick-up coil or ignitor unit.
No fuel reaching the carburetor
1. Clogged hole in the fuel tank cap.
2. Defective fuel pump.
3. Clogged or defective fuel valve.
4. Defective carburetor needle valve.
5. Clogged fuel hose.
6. Clogged fuel filter.
Replace.
Replace.
Repair or replace.
Tighten.
Replace.
See electrical section.
Adjust.
Adjust.
Replace.
Replace.
Clean or replace.
Clean and dry or replace.
Replace.
Replace.
Replace.
Clean or replace.
Replace.
Clean or replace.
Replace.
Clean or replace.
Clean or replace.
Engine stalls easily.
1. Fouled spark plug.
2. Defective signal coil or ignitor unit.
3. Defective fuel pump.
4. Clogged or defective fuel valve.
5. Clogged carburetor jet.
6. Valve clearance out of adjustment.
Clean or replace.
Replace.
Replace.
Clean or replace.
Clean.
Adjust.
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