I am new to this site and love it so far. I posted thread before but pretty sure it was in wrong category, so here it goes. I have a 2000 Yamaha SXr 700. It has about 5000 miles on it. I recently purchased it, fixed a couple small things that were wrong, (pull starter and i put aftermarket can on it.) I was riding it yesterday, and it ran awesome. Has new track on it, and a new belt. On it when i purchased it. Im a big guy, about 290 pounds, my brother, who goes about 230, stood on back, and i proceeded forward bout 20 feet to drop him off at garage. Alot of weight i know. I did go very slow, maybe like 5 or 10. He jumped off, i went to take off and heard a terrible noise. Sounds and feels like cogs are skipping on track (maybe). Only at very low speed it does this, and when u first take off. if you were cruising about 10-15 it seemed to stop. I picked back end up and gave it throttle and no noise. Is it possible bearings went bad? or track came loose? What do i need to check? Any help would be greatly appriciated.