TOHATSU MFS2.5B Owner's Manual page 50

50
TROUBLESHOOTING
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Engine makes noise
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Possible cause
Incorrect adjustment of throttle link
Insufficient cooling water flow, clogged or defective pump
Faulty thermostat
Cavitation or ventilation
Incorrect propeller selection
Damaged and bent propeller
Improper thrust rod position
Unbalanced load on boat
Transom too high or too low
Low compression
Carbon deposits in the combustion chamber
Too much the valve clearance