That was me on the throttle. Just really seems rich and flat, no? Anyone ever done a sync on these rack butterfly carbs? Seems wonky with the boost bottle etc. Might tell that again, get some rubber stoppers at the hardware store. Was just weird that the pro side would NOT seal up and pull a vacuum to make the gauge work. It's going to be my daughter on it so I really want it right. No issues makes a happy kids that want to keep riding!