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5. Troubleshooting
Trouble type
Possible reason
Engine over-speed(Excessive
RPM)
Outboard mounted too high on the transom
Worn jet pump impeller or liner
Incorrect jet pump impeller clearance adjustment
Tilting the outboard out beyond a vertical position
Cavitation of the impeller due to rough water or obstruction in the boat hull
Blockage of the water intake
Engine performance loss
Throttle not fully open
Damaged impeller
Incorrect engine timing, adjustment or setup.
Boat overloaded or load improperly distributed
Excessive water in bilge
Boat bottom is dirty or damaged