1. Troubleshooting List
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Fuel level is low in the tank.
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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.
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Engine oil lacks. (Oil warning lamp is lit.)
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Fuel is fed excessively.
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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
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No sparks or weak spark
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Stop switch short-circuited
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Ignition timing is not properly adjusted.
(
Ignighteor, valve timing
)
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Stop switch lock is not in place.
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Disconnection of lead wires or loose earth wire.
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Valve clearance is wrong.
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Cylinderhead sealing is defective.
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Valve seat sealing is defective. (Intake and exhaust)
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Piston, piston ring and/or cylinder is worn excessively.
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Combustion chamber excessive carbon deposits.
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Spark plug is loose.
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Coolingwaterisnotfedorlowduetomalfunctionorcloggingofpump.
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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.
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