I run a 15 x 17 on my 150 but the first question that you might need to answer is:
What RPM are you at when you are at top speed?
From what I have read it is hard to know what prop to use unless you know what your engine needs to run smoothly.
Almost forgot -- Welcome aboard. The guys around here can answer many of the quesions that you might have.
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'78 Cuddy with '82/'88 Johnny/Rude 150
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