TOHATSU MFS 6B Owner's Manual page 47

Possible cause
Low compression
Carbon deposits in the combustion chamber
Incorrect valve clearance
Low oil pressure/level
Low oil level
Use of improper oil
Oil deterioration
Clogged oil strainer
Faulty oil pump
Incorrect adjustment of throttle link
Insufficient cooling water flow, clogged or defective pump
Faulty thermostat
Cavitation or ventilation
Incorrect propeller selection
Damaged or bent propeller
Improper thrust rod position
Unbalanced load on boat
Transom too high or too low
TROUBLESHOOTING
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