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Urgent help oil leak

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Hi,

I need some help as I'm really concerned here. I just got delivered a used CRF150R Expert. Started it up second time and quite a bit of oil came out of one of the overflow tubes that links into a t that runs into the air filter and the other end into the engine case. Stopped it and restarted it a few minutes later and same thing happened as soon as it warms up, a big pool of oil below that tube. Please help as I'm really concerned what it might be.

Oil level is fine just below max, but transmission oil I don't know how much they've filled it up, but seems a lot of oil to just be over filled.

Thanks

Edited by blackcrf250

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Same issue, same situation. Puddle of oil on start up, steady stream no drip, from what looks like crankcase breather (just under rear brake lever). Stopped after riding a short while, but not before it drenched the rear brakes.

Is/was it over filled? Bad rings causing execessive crankcase preasure? Just looking for idea here.

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Mine was overfilled without a doubt. I just pulled the small plug on the right hand case and let it drain until it drained no more. About 1/2 qt. in my case. This method is also listed in the manaual for changes so refer to that section if unsure.

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