It looks to be a 1990 but I'm not the best at judging.
Track looks ok to me anyway, better than whats on mine. Your hyfax look fine, as seen in that first pic, once they wear down to that little line on them you should replace them. The track clips in between the track windows ride on them.
Nice looking sled you got there. Are you familiar with checking compression on these? I'd be curious to see where yours is sitting at.
If you do check, remove both plugs, make sure the kill switch is off and check each side one by one while holding the throttle wide open. Pull it over about 5 times and see where the compression is at.
That box is for storage, there is a metal shield around it to protect from heat, I've had no issues. I personally don't know where the grease points are, never done mine before. My speedo doesn't work but I've had mine up to about 60 (Im not a racer) just a joy rider. I'm not light either.