Just picked it up form the shope this weekend. While I was runing down the trail trying to see what the top speed would be it started to make a grinding/over reving noise. I was doing around 45 at the time. The quad has around 200 miles on it. After it made the nosie I just backed off. What could this be? I bought this used from my brother inlaw back in Dec for 4300.00. I had a 2000 Magnum that was perfect for four years that I sold to buy this. When it cold it bogs/skips.misses, runs good when its warm out. The speedo had to be replace and the master cylinder is new, I think I bought a lemon. And now this overreving.grinding noise. Any help?