I am new to the forum and new to the Seca game. I picked up a 92 Seca with 50k miles on it as a project bike and I am loving it! It's been a month and I haven't got in a car

Anyways. The bike is running great except sometimes at high rpms I can see the tach jump and feel the clutch slip. I wanted to know if anyone has had experience with this problem. I am running 20-50w oil. Could it be the wrong oil, bad adjustment, or worn pads?
I found these and think I may order some
http://www.ebay.com/itm/CLUTCH-FRICTION ... 3a&vxp=mtr
Any input is greatly appreciated