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so he had a single 300 on there before? No wonder he has problems, that is a lot of boat for that motor. If he would have done twins he wouldn't be re-powering unless he wanted to do it.
Propped correctly the weight and size of the boat does not matter. An outboard does not know if it is pushing a 70ft barge at 5mph or a 17ft speedboat at 50mph. An outboard propped correctly that can hit wot rpm has the same load regardless of the boat. The prop size and pitch controls the load.
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