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Just about anything will work for snowmobiles, start looking and see whats out there.440 or 500 cc should give you plenty of power. A 2-up is nice for bringing a friend along. Liquid cooled is a plus, but fans work just fine too. Stay away from sleds built in the early to mid 80s, they had crappy engines. Polaris 500 Indy's are all over like fly poo and they make a good ice fishing sled for cheap. Stay away from the triple cylinders and big bore go fast sleds if you can, they get awfully heavy and they are often severely beaten.Look at the skis and the belly pan, if these are bent and busted the sled has most likely been ridden hard.
This may be a dumb question, but liquid cooled are an advantage???
Yes when temps are above 30* and your working the sled hard.
Understood, and is there an equal and opposite disadvantage to it being below 30 and only using it to drag around a shack... can they freeze up??? If so, would an air cooled be better for that application?