'04 wr450f oil problems

hey,

I have a problem with my '04 wr450f where oil is being pumped out of what i think is the oil tank breather which is cast into the top right side of the cylinder head, just above the header pipe. when you hold your hand in front of the breather you can feel engine pulsations coming out of the breather and there is also smoke, possibly exhaust coming out of it. i'm thinking maybe this breather is cast along a exhaust port in the head and there's a crack in the wall between the port and the breather but am not real sure. Is there anyone with any ideas on what maybe happening?

Cheers

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