After riding I have been noticing that the engine casing is showing signs of leaking oil. I traced it to the base of the shift lever. I removed the shift lever and repacked the bearing behind it with grease. After a few rides the problem is back. A buddy of mine mentioned something about having to possibly split the cases. Anyone have any idea what is going on or encountered this issue previously? I am Ok with a wrench, but not that great at diagnosing issues.