don't know what to try next, engine was running beautiful 3 wks ago then there was oil/black stuff all around the flame arrester, and from then on the engine wouldn't run good, it will start but what i would call a cavitation or maybe starving for gas. so so far i have changed the plugs which looked fine, changed the fuel filter/separator which had no water in it that i could see, and the in-line filter at the carb, checked the rotor cap looked clean so i cleaned the points, last i took the carb apart cleaned it there was black s%%t at the top but the jets and inners were pretty clean but put a carb kit on it and put back together. started the boat and there was no change! the cavitation is the same at low idle and high idle?
