I recently bought a 02 S model bike with very low miles (2k). The engine has a lot of good parts: 434 Athena BB, Hotcams, FMF Powerbomp w/Q2 muffler, 3x3 mod, FCR 39 with Eddie's jetting specs. I don't think the carb is the "MX" version. The body casting has the slanted look and it doesn't have a hotstart knob on it. I'm having 2 problems with it. First when starting cold the choke seems to over-choke it. It will flood easily yet when choke pushed off it dies. While cold with choke off it hesitates terribly and stalls. Once warmed up, it starts perfect but still has a slight hesitation taking off from a stop. Other than that is runs great. Any ideas? Does this carb need the o-ring mod also?