I repowered at the end of the last season with a F-115 Yamaha and I ran a 3 blade 17 pitch alluminum (Yamaha) prop that gave me good results. I tried a 4 blade stainless 17 pitch (Solas) but the cup or something was different and the results were terrible. I purchased a 3 blade stainless Solas 17 pitch that I have not tried yet. With the 17p Yamaha Al prop my top end was 32mph turning 6000 rpm with 5 adults and a 160 qt cooler filled with provisions. I averaged 4 mpg which is a lot better than the 1.5-2mpg that I was getting from the 225 oceanpro. You want to run the 115 four stroke Yamaha on the high end of the rpm range and that motor is a 5000-6000rpm engine. hope this helped.
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1975 V-20 w/1996 225 Johnson
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