last night i blew up my sled. i was only going about 10km/hr and then it started to backfire and then it stopped on me. when i got it home i took off the rave valve and checked the left side cylinder and the piston had a few dents and there wasn't much left of the piston ring. the right side cylinder was perfect. the crank and every thing still spins. so im thinking all i might need is new pistons, rings and get it honed. i don't think it will need to be bored because the piston isn't to bad. does anyone know how much it might cost to get it rebuilt at a dealer. thanks.