Carb tuning, larger accelerator pump nozzle?

Transition issue aka pump shot, volume and its duration.
You'll figure it out.

Remember lean is when it cuts out momentarily and or jerks... while Rich is a bog which is deep & blubbery sounding but not jerky and missing...more like a garbage disposal fighting the chunks of meat....ghhrrrrrr..then it buzzes up in speed....or the mower over some gopher hills.