First, pull the belt into the secondary to take the stress off of the screws. Loosen the three small screws on the gold adjusting ring on the outside of the clutch. Rotate the cam ring counter-clockwise to reduce the distance between the sheaves. Don't rotate past the number 1, it will be a bugger to get open if you do.
You won't know what the adjustment is until the clutch can rotate. Do your best to pull the belt out to the outer edge of the secondary. If you can elevate the back of the sled, start the sled and let the track rotate a few times. That will allow the belt to operate normally. If you try to take off with the belt down in the clutch, it will be like taking off in your car in third gear; sluggish and unresponsive. You also take a chance on burning the belt.
2007 Dragon RMK 700 155", 2008 RMK 600 155", 95 Prowler 550 2-up, Really OLD AC Cheetah