I have a 1983 cc as well, with a (2005) f225 Yamaha. I have a 15 1/4 x 17 Saltwater Series prop that I used with my 2-stroke engine that I think was perfect for my boat, as long as I could turn the proper rpm. That prop was a little slow "out of the hole" and not turning quite enough with the 4-stroke and I bought a Solas 14 1/2 x 15 four blade that I am currently using. This prop performs well, but is slightly under pitched with a light load. Maybe one day I will get a f250 and put my Saltwater series back on.
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