Re: yamaha 150 4-stroke prop?
This isn't the answer you are wanting to hear, but you'd do well to actually try a few sizes out and see how they perform. Although tests are informative as to how the prop worked on a similar boat, even a different 20' SeaCraft may not work well with the same prop that really works great on yours. I found this out when propping my 140 Suzuki: what worked for some of the other SC20's here on the site wouldn't work for me at all...
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