Depends which model skat impeller. The big hub swirl would be too much for a 650. A hooker 9/15 would be perfect. I ran one on a 650 with same pipe and carb and it ran great. 43mph with just carb, pipe and impeller on otherwise stock 650
I still have the 9/15 but have a fully built 750 now and the 9/15 isnt enough so if you have the 10/18 that fits a 650 pump I might be interested in trading
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