TOHATSU MFS 25B Owner's Manual page 73

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*1: Horn also sounds continuously.
*2: Horn also sounds intermittently.
Low compression
Carbon deposits in the combustion chamber
Incorrect valve clearance
Low oil pressure/level, oil pump failure, Clogged oil filter
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(Pressure switch ON)
Insufficient throttle aperture
Insufficient cooling water flow, clogged or defective
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pump
Faulty thermostat
Cavitations or ventilation
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Incorrect propeller selection
Damaged or bent propeller
Improper thrust rod position
Unbalanced load on boat
Transom too high or too low
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A great deal of air is contained inside pump
TROUBLESHOOTING
Possible cause
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