Does anyone know of any company that makes a better water pump impeller and/or cover? I run enduros on the east coast with my 400 and trail ride in some tight stuff. I am planning on running waterwetter and I put a WR catch bottle on, but I really want to keep it cool! I know Boyesen makes them for the 2-strokes, but they don't list any thumper parts. Any help on the subject would be greatly appreciated! Thanks, Later!