I'll perpetuate the thread hijack.
I've not yet changed the prop but the 150 horse on mine only turns 5100rpm and does 44mph with a 19" on it.
I've got a 17" that I'm gonna try and see if I can improve the rpms, not expecting more mph but hoping for more mpg.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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