1. Troubleshooting Chart
Engine will not start.
Engine stalls immediately
after starting.
Idles abnormally.
Defective acceleration.
Engine speed is very high
causing high speed ESG to operate.
Engine speed is very low,
causing low speed ESG to operate.
Boat cannot run
at high speed.
Engine overheats.
Battery is not charged.
Starter motor
will not operate.
Estimated Cause
Fuel and Lubrication Systems Compression Electrical System Others
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Fuel level is low in the tank.
Fuel system connection is incomplete.
Air suctioned through fuel system
Fuel pipe is twisted.
Cap vent is closed.
Fuel filter, fuel pump or carburetor is clogged.
Carburetor is maintained poorly.
Low quality gasoline is used.
Fuel pump malfunction
Choke system malfunction
Fuel is fed excessively.
Acceleration pump malfunction
Low quality engine oil is used.
Engine oil is lacking (Oil warning lamp is lit).
Engine oil quantity excessive (Exhaust smoke is generated.)
Oil filter is clogged (Oil warning lamp is lit).
Oil pump malfunction (Oil warning lamp is lit)
Incorrect valve timing due to stretching or incorrect installation of timing belt.
Valve clearance is incorrect.
Intake or exhaust valve sealing is defective.
Piston, piston ring and/or cylinder is worn excessively.
Combustion chamber carbon deposition is too much.
Spark plug is loose.
Use of spark plugs not specified
Spark plug is contaminated.
No sparks or weak sparks
Stop switch short-circuited
Ignition timing is not properly adjusted.
Stop switch lock is not attached.
Main switch malfunction
Disconnection of lead wires or loose earth wire
Battery is out of service life, or electrode is eroded. Battery electrolyte level is low.
Battery charged insufficiently
Shift lever neutral (N) position is not proper.
Starter motor or starter solenoid malfunction
Cooling water is not fed or low due to malfunction or clogging of pump
Thermostat operation is defective.
Anti-cavitation plate is damaged.
Use of mismatched propeller.
Propeller is damaged or deformed.
Trim position is not correct.
Boat is unbalanced due to improper load position.
Transom is too high or too low.
Throttle link adjustment is defective.
Chapter 1
Chapter 2
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Chapter 3
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Chapter 4
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Chapter 4
Chapter 4
Chapter 3
Chapter 3
Chapter 3
Chapter 5
Chapter 3
Chapter 3
Chapter 5
Chapter 5
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Chapter 3
Chapter 3
Chapter 3
Chapter 8
Chapter 8
Chapter 3
Chapter 1
Chapter 8
Chapter 8
Chapter 3
Chapter 3
Chapter 3
Chapter 8
Chapter 6
Chapter 3
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Chapter 1
Chapter 3
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Chapter 1
Chapter 3
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