Oiling Trouble

2011 310 TE
Suddenly started burning oil and heavy smoking as it at the same moment started pushing oil out from the oil filter lid.
Filter in frame above head is lightly clogged and some oil in air box.
The mx model doesnt have this feature and I dont know how they are built?
Any ideas of problem?

Maybe a broken ring, piston, or cracked head (any water loss?)- but thats just a WAG. I'm trying to think of a valve problem that would both pressurize the case but also suck oil, but I'm coming up short.

How does it run?

The TC is vented to the atmosphere... take your hose off at the frame and start it up for a look. Next would be a compression or leak down test.

Good luck.

Make sure the breather lines are not pinched or clogged.

I once replaced two countershaft seals on my Wr400 before noticing that the crankcase breather lines were clogged under the skid plate.