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Fault type Fault cause Solution
The engine is
weak.
The bottom of the ship is polluted
by underwater organisms
Clean the bottom of the ship
Gear box twined by aquatic plants
or foreign matters
Remove the foreign matters and clean it
The spark plug is contaminated or
the model is incorrect
Clean it or replace with the correct spark plug
Fuel system blocked
Check the fuel line for extrusion, entanglement or
blockage
Fuel filter blocked Replace the fuel filter
Fuel oil polluted or obsoleted Fill the fuel tank with clean new fuel
Incorrect spark plug gap Adjust the gap to the specified value
Ignition circuit failure
Check the wiring. Tighten the loose wire and
replace the old or broken wire.
Ignition component failure Replace it
Incorrect engine oil grade or
excessive oil
Change to the specified oil grade or add it to the
proper position of the oil dipstick
Thermostat failure Replace it
Fuel pump failure Replace it
The fuel joint is not connected
correctly
Connect it correctly
Incorrect spark plug specification Replace it with the correct model
Excessive
vibration of
outboard motor
Propeller damaged Repair or replace the propeller
Propeller shaft damaged Replace it
Propeller twined by aquatic plants
or foreign matters
Remove the foreign matters and clean it
Mounting bolts of outboard motor
loosened
Tighten the bolts
Steering shaft loosened Tighten the shaft
Steering shaft damaged Replace it
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