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Water pump impeller mod

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You drill a 5/32" hole in between the blades. Apparently having a hole in the impeller helps equalize the pressure to make the work load easier on the pump. 

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Stock impellers on later years of the 450R's come drilled, so it's not some backyard mod.  No idea why 250 didn't come with that too (or did they?)

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I know my 06 250r doesn't haven't a hole in the impeller. Apparently it helps with cavitation. I'm gunna do it to my impeller just for fun. I know these bikes like to eat water pump shafts

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