Hello all once again. Just got a minor issue with my recently rebuilt 85 atc 70. I upgraded the oil pump, put an 88cc big bore kit on it, sandblasted all 3 cases inside and out, and all new gaskets. My problem is that, for some reason, when I turn it at high rpms, it seems to be throwing oil out of the crank vent on the case? Im assuming that is where it is coming from unless it is due to a bad gasket, and its causing it to leak from that. It only leaks from the top of the motor, and since its leaking from there, its making me think that it is coming from the crankcase vent. Any guesses on why? I guess oil is getting pushed up through the baffles (that are meant to stop this) inside the engine due to me turning it at a high rpm. its not much of an issue at the moment because its mainly used for trail riding, but every now and then, ill open er up and let it scream.
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Originally Posted by ATC King
