"It starts well, idels smoothly, and runs like a clock. Except, when I started it yesterday evening before our weekly race it spit out a whole lot of black crap that floated on the water in an increasing arc around the back end of the boat. And while it runs, the exhaust water is slightly dark and contains an oily film. It doesn't generate a lot of smoke. Just this black film in the water."
This is exactly the problem I am now having, were you able to come to any conclusion on the cause? Thx!
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