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It's a Yamaha 150 and currently WOT, trimmed well on flat water it runs to about 5200 rpm and 41-42 mph. He said his preferred cruising speed was about 4000 rpm which is about 29 mph or so.
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Those are pretty much my numbers to a T. I don't remember my diameter but I definitely have a 17 pitch prop on my V-21 with Yamaha 150 2 stroker...
I think you are good ;)