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YZ 125 overheating and leaking oil

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i just replaced the top end on my dirtbike, new gasket seals, new piston ring, i put it all together and put in radiator fluid. so i started it and it started steaming, i figured it was from burining oil on the engine case that was left from finger prints. but then i reached down and its really hot. then it started dripping oil. anyone know what could be wrong?

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Dont you have this exact same thread started already?

Check your head O rings as I stated in that thread. Its easy to pinch one because they dont fit exact. Rubbing a little Vasoline or grease on them helps seat them and keeps them from pinching between the head and cylinder, works rather well.

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