Has anyone had symptoms of drag on the back tire as the bike gets warm running for awhile? It started out as smoke and burning smell (but not tire burning smell) at high speed. I managed to pull into a gas station with the bike completely seized. After an hour or so when it cooled, I was able to get back home. I changed the back tire and its not a lagging brake. I changed out the clutch for a used clutch but it didn't last long. I changed all the friction plates in the clutch. I changed the oil and filter again. it seems alright at short distance but seems to tighten up when it's been in traffic for awhile. I changed the oil again and greased up the driveshaft. I guess you have to change the oil a few times until it's not so dirty for the new friction plates?