Mariner 60 Hp Bigfoot problem
I was 6 miles from port recently when the engine, which has always worked perfectly before, decided to play up. However much throttle I applied, the revs would not go above 2,500 and the boat would only manage 6 knots. Turned for home and did 20 minutes of limping when the engine sprang to life again and we got up onto the plane. Just outside the marina the problem occured again and is now present. When not in gear the engine will rev to 4,500+ as normal.
Any ideas as to what might be wrong or what to check first?