For small cc engines I've read that a certain degree of tradeoff can be had between low rpm torque and better breathing at high rpm by ovalizing the carb throat. This seems perfectly reasonable actually. Why is this not better utilized? Why not a taller thinner oval section yet so that your're effectively starting out with a 16mm carb up to 1/3 throttle and end up with an area equal to a 22mm carb at full throttle?
I just took apart an electric choke carb for the first time. Interesting in that the circuit is separate little "carburetor" in itself. Needle valve, throttle slide, air in, mix out, sips out of the bowl. Why couldn't this, with a bit of modification, be used for a throttle/torque boost at mid rpms?