Fault location
Fault | System | Observation | Cause | |
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Engine not starting | Ignition system | Ignition spark O.K. | Fault in fuel supply or compression | |
system, mechanical defect | ||||
or with difficulty |
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| No ignition spark | ||
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| or short circuit, spark plug or | ||
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| connector defective, ignition module | |
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| faulty | |
| Fuel supply | Fuel tank filled | Incorrect choke position, carburetor | |
| defective, fuel supply line bent or | |||
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| blocked, fuel dirty. | |
| Compression | No compression | Cylinder bottom gasket defective, | |
| crankshaft seals damaged, cylinder | |||
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| when pulled over | ||
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| or piston rings defective or improper | ||
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| sealing of spark plug | |
| Mechanical fault | Starter not engaging | Broken starter spring, broken parts | |
| inside of the engine | |||
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Warm start |
| Tank filled ignition | Carburetor contaminated, have it | |
problems |
| spark existing | cleaned | |
Engine starts but | Fuel supply | Tank filled | Incorrect idling adjustment, | |
dies |
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| carburetor contaminated | |
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| Fuel tank vent defective, fuel supply | |
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| line interrupted, cable or | |
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Insufficient | Several systems | Engine idling poor | Air filter contaminated, carburetor | |
performance | may simultaneously |
| contaminated, muffler clogged, | |
| be affected |
| exhaust duct in the cylinder clogged | |
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