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2001 yz 426 water problem

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There is (or should be) an O-ring at the joint between the right crankcase cover and the crankcase to seal the water passage from the pump, another similar O-ring at the cylinder base, the head gasket, and that's pretty much it, unless someone decided to monkey with the hex head plug in the center of the head, between the cams. A missing or damaged water pump seal should leak to the outside.

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