Hi guys kinda new to snowmobile performance . Herein the cornfields of central illinois if a guy had a john deere trail fire or a yamaha phazer he was IN lol . Ive got this 92 jag special . It has had work done to the carbs and clutches . It got a dead hole , burned piston and stuck rings . I am getting ready to replace and then wondered if there are big bore kits for 440 fan motors . I am really wanting a little sleeper sled. ANY advice is greatly appreciated.