I have an 03 Rev 600 H.O. Its running on one cylinder and as far as I can see there is no hole in the piston. Everything else is fine. I heard the rings were made cheaply on the Rev and a lot of people have had trouble with them. Theres only 2000 miles on it. Has anyone else had this problem? I also read in a magazine that Skidoo has changed the piston rings on the 04 model rev because of the problems they were having with them.