So I've noticed something with older carburetors, specifically the Zenith on our A as well as whatever fancy carb is on this supercharged Duesy.
As heard in this video when the engine is revved and the carb is closed fast the engine stutters / misses.
http://youtu.be/QOQFDxRPdWM?t=37s
Is this because the mixture leans out momentarily and if so why? What changed in more modern carbs to stop this?