I have a 2005 S83 that I bought with 6200 miles and have only put about 400 miles on it in a few months. It had a bad carb that resulted in fuel leaking which was fixed. Since then when I first start it up it runs great, but after riding it seems to lose power in all gears, especially in the low end. It also backfires often, and am unsure of the cause of either or if they are related. Any help is much appreciated.