Duke 390 22’ Gear Lever Oil Leak

The black rubber oil seal has gone bad, change it and the leak will stop

If its new its covered by KTM for two years. Pop down to a dealer and book it in for a warranty job. Chances are there has been a burr or swarf on the gear shaft which has damaged the bearing seal.

Is it leaking or have you just noticed it is oily/greasy?
Could this be that this is installing grease?
Try to wipe it dry on the outside with some paper tissue and see if it stays dry or leaks.

Why do I always have the urge to say things like...

"Yep, that's a bleepin' dead alien alright."