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O
Troubleshooting
K
1. Troubleshooting List
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9-2
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Fuel level is low in the tank.
Fuel system connection is incomplete.
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Air suctioned through fuel system.
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Fuel pipe is twisted.
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Air vent screw is closed.
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Fuel filter, fuel pump or carburetor is clogged.
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Low quality engine oil
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Low quality gasoline
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Engine oil level is too high.
Engine oil lacks. (Oil warning lamp is lit.)
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Fuel is fed excessively.
Carburetor is maintained poorly.
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Oil pump malfunction.
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Use of spark plugs not specified
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Spark plug carbon deposit or bridge
No sparks or weak spark
Stop switch short-circuited
Ignition timing is not properly adjusted. (Igniter, valve timing)
Stop switch lock is not in place.
Disconnection of lead wires or loose earth wire.
Valve clearance is wrong.
Cylinderhead sealing is defective.
Valve seat sealing is defective. (Intake and exhaust)
Piston, piston ring and/or cylinder is worn excessively.
Combustion chamber excessive carbon.
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Spark plug is loose.
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Insufficient cooling water, defective pump or clogging by dirt.
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Thermostat operation is defective.
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Anti-cavitation plate is damaged.
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Use of mismatched propeller.
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Propeller is damaged or deformed.
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Thrust rod position is not correct.
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Boat is unbalanced by load position.
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Transom installation height is too high or too low.
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Throttle link adjustment is defective.
Probable Cause
4st 4/5/6 2020
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