Have a 32 foot sportfisher with 2 marine power 350's. (approx 580 hours) Coming back from catalina a couple weeks ago, i noticed some grey smoke coming out the back. Took it out yesterday and had heavy white smoke, followed by engine overheating. Turned off the engines, did a inspection and figured it was kelp that clogged the intake, dove down and found the intakes clear. Started the engines back up, and temps went down, but now the grey smoke is back as well as too much white smoke and the boat seems like it has lost horsepower. i was at 2900 rpm and could not even get on plane. Checked the oil and it still looks good, not milky white... ideas? The risers were just replaced and the heat exchangers were boiled last fall and raw water pumps have less than 50 hours on them.
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