Don't put too much money into that sled. Ride it and have fun. Keep it as a good trail sled or 2nd sled when you have the cash for a mtn sled.
If you could find a 1" or 1 1/2" track for it that would help. You might be able to extend it a little, but doing all of this may require gearing down, carb and clutch work. It could be more expensive than you first think.