I bought a used 700 that had a big bore kit and a performance/upgraded clutch with 26 inch SS rims/tires. Ive driven it for about 60 miles since I bought it. I took the twin brothers exhaust off as it was too loud and put the stock one back on. I noticed afterwards that there was a knocking sound from the motor. I took it out riding on trails today and the clutch was making all kinds of clanging and a friend who was behind me thought it sounded like a turbo unit on a vehicle. It made noise when slowing down, steady speed and speeding up. It began smoking and had no pep. I got towed back as the clutch case couldn't be touched and it was smoking something fierce. I only have 300 miles on the four wheeler. Any suggestions/ideas?