Hmmmmm? I put a D&D pipe on, holeshot jet kit and the ignition advancer. It had a dead spot just above idle. I got used to it eventually. Then, this spring I cut about 6" off the D&D can and it actually runs much better now. I don't know why but it looks cooler too. I guess it was rich and this leaned it out a bit maybe. It could be too rich. Carbs can be frustrating sometimes.