Hi everyone, I have an 06 DS650X with an FMF Powercore 4, K&N air filter and precharger, and a DynoJet/FMF stage 1 jet kit. I recently had my carb rebuilt, but it now sputters when I pin back the throttle at low rpm's, and then takes of. It also backfires and cuts out a lot at low rpms if I hold the throttle constant. Does anyone know what's wrong with it? I'm not sure if it's just a dirty pilot jet (which should be clean since it was just rebuilt) or if it needs a new accelerator or something?? Please help!