I got the sled out for the first time this year. Since we had a blizzard yesterday most of the snow is in hard piles but at least its good to see how the machine it running. What issue I'm having is its a little boggy from a dead stop. Some background. The sled is a 1998 Indy 500 carb with only 367 miles. Really, only 367 miles. It looks like it just came off the showroom. Anyway, the carbs are clean and adjusted the way I think they should be. When I got it the air screws were at 1.5 turns out. I looked on line and see the owners manual supplement says .75 out - so that is what I adjusted them to. It is much better than when it was 1.5. Now I'm not a small person, 6'6" and 385 lbs. X-college football player so maybe it just my weight bogging it down. I have to say the belt is also the original one - maybe it dry??? It did seam to be better the longer I rode it, about 15 minutes. Once it gets past the initial movement it goes like crazy, I'm really amazed how much power this thing has as it gets going. But I'm basing my experience on an old JD Liqufire. Any help would be appreciated. Thanks.