Had an 01 800XC - all sorts of problems - biggest of which was continually freezing carbs (huge fuel consumption issues) and lack luster performance. Dealer installed heated carbs and 430 mains and put needle clip in 2nd position from top. Everything else stock. Machine finally ran acceptably, and fuel mileage was reasonable (I did not handle bar it across lakes if really cold out.) No problems with sledding over the 100 mile range (company was always a ZR800, and MXZ 800s, thus had to keep up). This year's 800XC is a completely different sled - do yourself a favour (if able) and get rid of the 01 800 and get onto an 02 800. FYI - this past week, did a tour - 135 miles and still had 5+ litres of fuel in tank. Mileage approached XC600's!