Why won't my impeller spin???

Location
Salem, OR
I bought an impeller off of ebay for $80 and it isn't fitting on my pump. When I look at the back of both and compare them the impellers hole (for the bolt) is inset differently. When I tighten it down it won't spin at all. I guess I got the wrong impeller???

Thanks for your help! Just trying to figure this out before I kill my ski.:shooter3:
 
The 650 and 750 impellers are very both 140mm but they are not the same.
I've used 650 impellers in 750's before. You would need to make up a spacer for behind the impeller and maybe one to keep the driveshaft from sitting back to far too.
Later
Steve
 
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