Troubleshooting; Engine Over-Speed (Excessive Rpm); Performance Loss - TOHATSU MD 25B2 JET Owner's Manual

M25 Jet Drive

TROUBLESHOOTING

Engine Over-Speed (Excessive RPM)

POSSIBLE CAUSES
• 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.

Performance Loss

POSSIBLE CAUSES
• Throttle not fully open.
• Damaged impeller.
• Incorrect engine timing, adjustments, or setup.
• Boat overloaded or load improperly distributed.
• Excessive water in bilge.
• Boat bottom is dirty or damaged.
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