63
TROUBLESHOOTING
Possible cause
Incorrect valve clearance
Poor sealing of cylinder head
Poor sealing of intake or exhaust valve seat
Wear of piston, piston ring and cylinder
Carbon deposits in the combustion chamber
Poor tightening of spark plug
Insufficient cooling water flow, clogged or defective
pump
Faulty thermostat
Damage of anti-ventilation plate
Incorrect propeller selection
Damaged or bent propeller
Improper thrust rod position
Unbalanced load on boat
Transom too high or too low
Transom too high or too low
11