Well something aint right. I cant imagine that no matter what prop you have on there you would only go 23 at 5100 rpm. check that you're tachometer and your speed measurement is accurate. And then check somebody didnt load your boat up with a ton of bricks... probably can rule that out. Check the pitch on your prop and report back....some pictures of the prop might help too.
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1986 V-20
1986 Yamaha 150 HP
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