Leaking coolant

1 reply to this topic
  • rsumney

Posted August 03, 2010 - 06:29 PM


06 450 over heated due to loss of all coolant during race. Bike stalled out and was pushed back to pits. Replaced bad o ring on radiator now all coolant is coming out of drain hole on waterpump cover..What type of problems am I looking at. I havent taken cover off yet. Im hoping all it needs is a new gasket or seal. How big of a job could this turn into? Bike started after first kick today then I noticed coolant leaking out.

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  • grayracer513

Posted August 03, 2010 - 06:40 PM


Water pump seals and probably an impeller shaft. Drain the coolant and oil, remove the RH crankcase cover, remove and inspect the shaft. You'll be looking for a groove worn into the shaft by the seal. If there is one, you need a shaft. Replace both seals and the bearing. You should also check the RH balancer shaft bearing:


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