Ok, I've been on here a few times and it's been a tremendous help in many of my ventures with my '86 max. I have about 65k miles on it and recently found that when I really romp on it in first gear there is a VERY noticeable jerk/slam/pop/clunk/thunk type of noise and feeling in the bike. Sorry, my description sounds very strange, I'm sure. It feels like the bike slips out of gear for a split second and then slams back into gear, or as if it loses spark for a split sec. And if I stay on the throttle hard it continues to do it repeatedly every tenth of a second or so until I back off of the gas. Also the revs are around 5k-7k and it only happens when I really crank on the throttle. When I go easy on the gas, it never happens. I've tried looking on here for anything similar and haven't found anything even close. Any suggestions would be greatly appreciated.