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    The proper prop?

    I have a 1990 E28 with a Universal M3-20 engine with only 835 hours on it. The engine runs great and I burn only about a quart of diesel fuel per hour. I'm getting some soot on my transom and I wonder if I'm running her to hard or is the pitch on my prop to great? My prop is a 12" fixed 2 blade...
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