I am looking at buying a 00 Quad Master 500. The guy says it runs great, but it will not move in 2wd or 4wd, he said he has taken the belt cover off and everything seems to be working inside there, but it will not pull itself. He even says that the speedermeter moves. I am unfamiliar with this particular quad and the way it transmits it power passed the pulleys, so any ideas. I am thinking worst case and it is not worth messing with, but has anyone delt with this before? Thanks