Basicly it was pretty good out of the crate, but on my 2001 sno-x i did run the x-c's jetting and i u8pdated my needle jet with a diffrent profile to enrichen the midrange. and updated the return springs for the power valves to a set from a zr500 with some more tension, check to see if any of these items were done . I still have all my manuals from 2001 nd part numbers if you need the info, but drop me a email or pm as i usually hang in the firecat fourm.