Well, the 1993 XLT that I spoke of in earlier posts is now up for auction on Ebay along with another frame/parts sled. The 580 damaged a piston and has put some gouges in the cylinder sleeve. I was told by a couple of people that my best bet would to install a replacement motor as the crank may have gotten some metal fragments in it. However, it is now listed on Ebay with only a couple of days left if anyone is interested.
eBay Motors: 1993 Polaris XLT 580 snowmobile needs repair + extras (item 220203607006 end time Feb-25-08 18:58:02 PST)