Question about 2002 KTM MXC 400 Racing

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Camshaft on my 01 mxc400

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I had a complete set of new seals installed last fiday and the pump appeared to be nice and dry? While sitting at the starting line for the district 37 grand prix last Saturday with the bike idling I looked down and fluid started spitting out of the weep hole?? I turned off the motor and it eventually stopped leaking. I went ahead and raced and it leaked a small amount more throughout the day??? Any ideas?? other than maybe it was a bad seal? or a bad installation from my local shop??James is probably right. The stock o-rings KTM sells for the carrier are 2-3 sizes smaller than they should be. I bought a bag of the corect (IMHO) o-rings. When you stretch an o-ring it gets thinner the further you stretch it the thinner it gets until it breaks. Since the o-ring is stretched thinner on the carrier it is not compressed properly it looses some of it sealing surface and can't hold the pressure as well. I think this is the reason most of the newly replaces water pump seals leak. That's why it will start leaking as the motor heats up and will continue to leak until the motor cools off and the pressure is gone from the cooling system. To test this warm the motor up and note how long it takes before the coolant starts leaking. Let the bike cool and then remove the radiator cap and warm the engine up if there's no leak then the o-rings are probably bad if it starts leaking then the seals are more likely the problem.,,,

Posted on Nov 10, 2008

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