My 06 just did the same thing, lost crank case seal behind clutch basket, pumping tranny oil into motor till too full, hence going out the vent tube. check how much oil is in tranny, I bet its low, mine was almost empty. but motor was full to filler!!!
It almost sounds like a ring is broken and you are looking at a motor teardown if you have excessive suction in the crankcase.
Ken S.
We had this same problem with our trx 450r after a complete rebuild which included a new crank,bearings and seals. Turns out the crank seal behind the clutch basket was installed incorrectly.
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