a stock 650 setup in a sx will really struggle to turn a sxr prop. I had a 15.5 in mine. Then Piped it and added new head plus bigger carb and reeds etc many years ago. Then finally I went to the 8/16 skat. It was the best she could do for that setup..
15.5 is a great prop for that engine and pump. I had one on several different 650 skis (X2, 650sx, 300sx/650 conversion) From a stock engine all the way up to a worked over 650. Always hooked up great and never missed a beat!
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