Been driving it quite a bit lately and have an issue with it popping through the carb just off idle once its warmed up. It idles perfect and runs great going down the highway but pops when leaving a stop. If I am very gentle or rev it up and leave with authority, it wont do it. It doesn't have a tach, so I would guess its popping around 1000-1200 rpm. Ive messed with the timing in both directions, and it doesn't make a difference.