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I would think that compression is by-passing the rings is causing excessive crankcase pressure and that is what is blowing oil thru the crankcase vent tube -----if the vent tube was disconnected from the air box and run into a clear water bottle and hung on side the frame while taking a ride might show if that is where it is coming from or direct you in another direction
If its a 2001 have u checked the spark screen on the muffler - if its plugged
 
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