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m3-20

  1. Diesel
    Calling all mechanics for ideas :) I have a 1990 Catalina 30 with a Universal M3-20 (18hp) engine. I discovered about 3 seasons ago if you run the engine in gear over 2000 rpm there is black smoke/soot/particulate matter in the exhaust. Since then I've only run the engine up to 2000 rpm and can...
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