First off you are going to have to go get yourself a turbo or a big bore kit as I have heard they are way under powered and you don't want to get left way behind all the old doo revs on the way up the hill. And if you go the turbo route you best go get new pistons, cylinder and crank as you wouldn't want the whole thing blowing apart and leaving you stranded on your first trip out. Kind of embarrassing to have that old doo rev tow you back home.
Then you are going to have to get new shocks and a-arms cause if you are over 90 lbs. they will never stand up, you will have the worst ride ever, just a nightmare.
Then there is the track, once the snow get deeper than the lugs you will be constantly stuck, that ain't fun. So best just get that changed right away.
While you have the track out probably should change out the drive shaft, that is if it still in one piece after you have unloaded it off your truck. I have read that they fall apart anyway and again don't want to get towed home by that old rev. remember.
I suppose when you have the track and shaft out why not just go ahead and through in a new belt drive the one it came with I have been told won't get you around the first curve on the trail. That old rev is just lurking around waiting to tow you home, very embarrassing.
After this you should almost be ready to take her out for a spin, not going to enjoy the ride tho cause it has this terrible flat steering that gives the machine horrible handling charicteristics, you won't be able to get anywhere on this thing.
Or... Or....... You can just do like most of us have ignore most of the crap you will read or hear about these sleds add fuel pull rope and go shred up everything in site, and have the best winter you have ever had on the most funnest sled ever made!