I don't know your bike specifically, but found this thread
on another website, I hope something in here will give
you a clue.
Read below in quotes FWIW.
"I too just had mine apart . Just did a bottom end and about 3 months prior. For some odd reason, the case screws where a little loose. (they where torqued) I suspect the gasket got warm and squished down a little more making the hardware loose. What I'd try is to tighten them all down some more. You will need to pull off the flywheel and stator plate to get the most critical ones. But should be able to do it in the frame. No removal needed. I went into mine knowing there was a leak, not sure where. And came to the conclusion it was a case gasket. When you have yours apart, did you replace the small oring behind the clutch side drive gear. Its under the collar. Otherwise, you can ingest oil from under the collar. Something else to consider too."
"I might add ours ran great too. We only had a little more smoke on cold start up. And of course, slowly loosing gearbox oil. But no external leaks either. Try snugging the case screws. If they feel looser than norm, you may have found your problem. I wish I would of checked that first. I ended up taking it all back apart to replace that case gasket and after getting in there, seeing it was semi loose, but gasket in great shape, a case screw snugging would of done the trick."
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2011 Husaberg TE 300
2002 640 LC4e 
Past Rides
'03 KTM 450 EXC (SOLD)
'01 Honda XR650R (SOLD)
'98 Honda XR600R (SOLD)
'95 KTM 620 RXC (SOLD)
'88 Yamaha TT600 (SOLD)
'86 Yamaha XT 350 (SOLD)
'84 Yamaha IT465 (STOLEN)
'83 Kawasaki KDX 450 (SOLD)
'83 Honda CB1000 Custom (SOLD)
'82 Kawasaki KDX 400 (SOLD)
'77 Yamaha DT200 (SOLD)
'70 Honda CT70 (SOLD)
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