It all depends on what you are looking for, and how much you want to spend. My buddy put a Bombadier 670 engine in a Polaris XC 400. We also replaced the entire front suspension with aluminum. We replaced the rear with a M-10. We had Jaws make pipes to fit the Bombadier to a Polaris body, and put a digitron racepack to keep track of temps. Everything on the extertiror looks stock (except for the suspensions). What a fun , fast sled that gets attention wherever you ride it. That was about 7 years ago, when the Pol-Bomb was born.
Since it is just like an Indy 440 and not an xc or xcr, I don't think it would be as easy to install a 700 twin. I would maybe look for a new snowmobile instead, it is a lot less work. Sell those dang jet-skis and get a snowmobile!
Hey looser (trent)! what, you decide you need a bigger motor to keep up with me or what? jk...you're just never satisfied are you? and i can't believe you're still looking at that old stand-up in northome, just buy it already, its not like its that expensive.
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