Would put money on the fact Ur belt tensioner isn't spinning ! Mine did that and eventually snapped the belt, if u have a bunch of fiberglass looking dust in there that means that's what it is and it's eating if belt ! After I replaced my belt I replaced the tensioner with 5x10 bearings so it would never happen again ! Hope this helps ! If Ur like me and snap a belt at the track good luck finding a replacement !!