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Spark plug other than specified
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Dirt, soot, etc. on spark plug
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Faulty oil pressure switch
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No Spark or weak spark
Short circuit of engine stop switch
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Ignition timing incorrect
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Lock plate not fitted
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Disconnection of wire or loose ground connection
Blown 20 Amp fuse in the starting circuit
Not shifted to neutral position
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Weak battery or battery connections are loose or corroded
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Ignition key switch failure
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Wiring or electrical connection faulty
Starter motor or starter solenoid failure
TROUBLESHOOTING
Possible cause
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