Welcome to the forum! Seems like a really decent deal. If you're new to sleds, one of the best things you could do is bring a snowmobiler buddy along with you to look at it. Common things to check would be engine compression, condition of the track and suspension components, hyfax and carbide wear, a straight tunnel and good general cosmetic shape will also be a factor. If possible, run it on a track stand and observe the driveline components. Make sure the clutches shift smoothly and watch for vibrations or in the primary. Other than that, just general things like oil or coolant leaks. (You're mechanically inclined, use your own judgment) Good luck!
2006 Arctic Cat Crossfire 7