I have a 2001 CR125 that has never given me any problems and runs great but just recently I was at a track with my friend and while riding, as soon as I got into the powerband it was like hitting a wall, and the power stopped. I replaced the oil, air filter, spark plug, fresh gas, and flushed the carb out. The next day I went on a trail ride to see if the problem was fixed, and it was the same and seemed like I had the power there but it wasn't engaging. So I took out the clutch today and the basket was grooved and the friction plates were worn down beyond recognition. I hope this is the only problem and when replaced, it should be fine, but does anyone have any ideas to what would cause a problem like that. The best way I can describe it is regardless of how much gas I give it and whatever RPM its at, it still has the same force to the back wheel like something is slipping.