Sweet looking ride you have there.
Yep, Shiney is right. I think it eventually leads to the clutch slipping, so it is probably a repair you want to start thinking about.
1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals
My wife's recipe website that I'm trying to help promote:
Strawberries for supper. Yes, I am a lucky man.