![(Use Engine will not start:](/images/new-backgrounds/89759/8975937x1.webp)
Problem |
| Possible Causes |
| Probable Solutions |
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Engine misfires | 1. Spark plug cap loose. | 1. | Check wire connections. |
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| 2. | Incorrect spark plug gap or | 2. |
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| damaged spark plug. |
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| 3. | Defective spark plug cap. | 3. | Replace spark plug cap. |
| SAFETY |
| 4. | Old or low quality gasoline. | 4. | Use only fresh 87+ octane |
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| unleaded gasoline. |
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| Do not use gasoline with more than |
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| 10% ethanol (E15, E20, E85, etc.). |
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| 5. | Incorrect compression. | 5. | Diagnose and repair compression. |
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| (Use Engine will not start: |
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| COMPRESSION RELATED section.) |
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Engine stops | 1. | Low oil shutdown. | 1. | Fill engine oil to proper level. Check |
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suddenly |
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| engine oil before EVERY use. |
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| 2. | Fuel tank empty or full of impure or low | 2. | Fill fuel tank with fresh 87+ octane |
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| quality gasoline. |
| unleaded gasoline. |
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| Do not use gasoline with more than |
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| 10% ethanol (E15, E20, E85, etc.). |
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| 3. | Defective fuel tank cap creating | 3. | Test/replace fuel tank cap. |
| SETUP |
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| vacuum, preventing proper fuel flow. |
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| 4. | Faulty magneto. | 4. | Have qualified technician service magneto. |
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| 5. | Disconnected or improperly | 5. | Secure spark plug cap. |
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| connected spark plug cap. |
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Engine stops when | 1. | Dirty air filter | 1. | Clean or replace element. |
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under heavy load | 2. Engine running cold. | 2. | Allow engine to warm up prior |
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| to operating equipment. |
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Engine knocks | 1. | Old or low quality gasoline. | 1. | Fill fuel tank with fresh 87+ octane |
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| unleaded gasoline. |
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| Do not use gasoline with more than |
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| 10% ethanol (E15, E20, E85, etc.). |
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| 2. | Engine overloaded. | 2. | Do not exceed equipment’s load rating. |
| OPERATION |
| 3. | Incorrect spark timing, deposit | 3. | Have qualified technician |
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| buildup, worn engine, or other |
| diagnose and service engine. |
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| mechanical problems. |
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Engine backfires | 1. | Impure or low quality gasoline. | 1. | Fill fuel tank with fresh 87+ octane |
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| unleaded gasoline. |
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| Do not use gasoline with more than |
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| 10% ethanol (E15, E20, E85, etc.). |
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| 2. | Engine too cold. | 2. | Use cold weather fuel and oil |
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| additives to prevent backfiring. |
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| 3. | Intake valve stuck or overheated engine. | 3. | Have qualified technician |
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| diagnose and service engine. |
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| 4. | Incorrect timing. | 4. | Check engine timing. |
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Follow all safety precautions whenever diagnosing or servicing the equipment or engine.
MAINTENANCE
Horizontal Engines | For technical questions, please call | Page 19 |