I believe the '97 SKS 700 motor was the watercraft motor that Polaris made, in '98 they went with the Liberty twin. As for the 220 cylinder castings, yah Polaris knew about the rings catching, and if you buy the sled which is a solid price I believe, after the season concludes, and you want assurance, do a top end rebuild, and have a machine shop chamfer the ports for you. You would be into a new gasket set, I would re-ring it, and machine shop work, maybe $125
Three-1999 Polaris SKS700's
2000 Polaris SKS700
2000 Polaris Ranger 6x6
2007 Polaris Sportsman 800 EFI X2
2000 Yamaha YZ 250
1996 Yamaha WR250