YZ426 leaking oil

got a yz426 that has an oil leak that is driving me nuts. it seems to be coming from around the front sprocket shaft. i have replaced all the parts twice but it still leaks. have replaced seal, o-ring and even the collor but it still leaks. any ideas.

Mark

Leaking someplace else, bad bearing for the countershaft allowing the shaft to run out in the seal (off center).

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