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As background, I bought the hull a few years ago, and invested in an almost new 4 stroke a two years ago. I adjusted the height of the motor last year, which made a BIG difference, and this year I want to work on finding the right prop. While I've seen lots for 2-strokes, I haven't found much on where to start on where to start on this quest with my 4 stroke. I am not fortunate enough to have a tach (maybe someday...), and my current prop is an aluminum Black Max 9.75" X 9.5p and does around 25 MPH with a light load. If someone could point me in the right direction (article or advice), I would be most appreciative.