Today I drove 30 Miles home from work on the interstate 65-70 mph, then when I got off on my exit and shifted back up through gears to sixth, after about quarter Mile it popped out of gear and revved way up! It Def was not slipping I pushed it back up into gear. The bike is an 82 sohc with 8100 Miles on it, I'm on my second oil change with shell 15-40 non synthetic, just plain desiel oil. Both ends of cable is adjusted per the manual and it shifts smooth and grabs nice, how long Will clutch pads last assuming the bike was not abused by the po? Could worn pads even be the issue. I have driven this bike almost daily since it's been nice and have never had this happen.