ac bigbore

Loosen track adjustment bolts till track is quite loose. Remove rear bolts that go thru tunnel to skid. Remove front
bolts thru tunnel to skid. Put sled on its side by lifting
up by a ski spindle. Pull out skid. You may have to put sled on side before the last step, or alternate tipping on sides.

The trick is getting it back in. First attach the front skidframe bolts. Then the debate started on an earlier thread this fall on how to proceed. The back skid holes will not line up now without force. Some say to first unspring the skid and loosen the limiter straps before putting the skid back in. My method is to have 2 people handy if possible, and use a come-along attached to the ski spindle or something sturdy in the front of the sled, and one of the cross members of the skid near the rear attachment bolts. Have one person pull on the come along until the bolt lines up in the hole and slide it in. Repeat on the other side.

While skid is out, inspect all idler wheels. On an 89 you will likely find some bad bearings. Maybe replace the main springs- the sled doesn't have much travel to start with, and you want all the spring force you can get. Good luck.