WR 450 BLOWING OIL INTO THE AIR BOX

My friend has an 08 WR 450 and is sitting in the desert with an air box full of oil. I thought maybe it was over filled but it didnt do it in the morning. We went out for a ride in the afternoon and when we got back from our ride there was oil all over. At idle nothing is comming out but when you rev it up oil is comming out of the valve cover vent tube in the air box. Any ideas? Thanks

Edited by klx450junkie

Worn piston rings? Maniac

Probably a clogged lower case vent tube (the one that runs low on the left)

Thanks guy's it was over filled......

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