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Symptoms - intermittent rough idle getting worse over time, eventually leading to obviously running on 3 cyls all the time.. Tried new gas, changed all filters. Pulled plugs, all look OK except #2 is full of soot and there is a drop of gas sitting in the plug gap. Change plug, runs beautifully for a week and then problem starts again (slowly). I have hauled the boat for the season and it is in the shop but would still like to follow up on second opinions. These engines are famous for carb problems with very small passages, but in this case, all I can think of in that direction is some carb fault which is pumping too much gas or a way-too-rich mixture into that cylinder. Possible?
But is not the problem more likely possibly weak or intermittent ignition on cylinder 2? Eventually fouling the plug? I'm getting feedback that ignition problems are unusual on that model But obviously anyhing can happen. Wiring is solid and looks almost brand new. Coil?
