Oil coming out of exhaust?

Today oil started coming out of the exhaust and the bike just dies randomly when I'm driving. Oil doesn't seem to be leaking out of the engine itself, I only see it in the exhaust and the exhaust is an ugly burn. Any idea what is causing this? I've done nothing new to the bike lately. I suspect the o-ring broke. Does that sound right?

How difficult is it to replace this?

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References www.motorcycleforum.com/59-motorcycle-repair/108918-oil-coming-out-exhaust.html

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