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Old 10-13-2011
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It would be best to contact a propeller shop and let them determine which prop is right for the boat/motor/trans that you have. You want to size the prop so that the engine will be able to reach the recommended rpm in gear. If you put a prop on that is too large or has too much pitch it will be extremely hard on the engine. With the engine model, transmission ratio and the length/displacement of the boat any competent prop shop should be able to get very close on sizing a prop for you. It would also help them if you know the dia. and pitch of the prop that is on now and what your top rpm is at WOT in forward.
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