Join Date: Apr 2012
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Racers! Water Pump Modifications?
For those racers out there (seemingly few?) that have rebuilt the bottom end of your 675s, I am curious if anyone has stumbled across any ideas to help with the parasitic loss from the water pump shaft seal?
The oil pump polishes up nicely and is quite free in motion, but the water pump seems to bind quite a bit. Since it is an oil/water boundary it can't be opened up too much, but I was surprised to find how stiff it was.
Any clues? (besides simply slowing down the pump with the KIT oil pump gear and chain)