I found this sled for sale localy 1999 POLARIS XC 600 INDY XC600 TWIN. What is your opinion of this sled? What was its strong points and shortcomings of this sled. Is the engine usually dependable? It has a burned down piston. I dont know if the piston burned down because of carberation or a crankcase seal? Does this model sled have any specific maintainance issues? Things to look for when I check it over. What would you pay for it?? Any help would be great!!! Thanks!