polaris man is right, to assist further, place the weight about 16" ahead from the center of the rear idler, and when you measure between the track and the slides should be 3/8 to 1/2".you will also have to check that the track is alligned right also, to do this, start you sled(after you tensin the track) let the track spin at an idle, then if the track goes to the left, tghten the left side adjusting screw, goes right, do the same on the right adjusting screw. and of all else fails, contact your local polaris dealer.