TOHATSU MFS 25C Owner's Manual page 86

84
TROUBLESHOOTING
Possible cause
Low compression
Carbon deposits in the combustion chamber
Incorrect valve clearance
Low oil pressure/level, oil pump failure, Clogged oil filter (Pressure
switch ON)
Insufficient cooling water flow, clogged or defective pump
Incorrect valve timing (timing velt elongation or incorrect
installation)
Intake/exhaust valve seal failure
Excessive wear of piston, piston ring or cylinder
Insuffcient tigtening of spark plug
Faulty thermostat
Cavitations or ventilation
Incorrect propeller selection
Damaged or bent propeller
Improper thrust rod position
Unbalanced load on boat
Transom too high or too low
A great deal of air is contained inside pump
Insufficient throttle aperture
11