Our German made Syncrometer takes carb balancing into the 21st century with an easy to read calibrated scale. The rubber adapter ensures an airtight fit for accuracy everytime. Will also work to set a synchronized fast-idle setting for when the choke is pulled.
In the early days the recommended method was to use a section of hose to listen at the mouth of the carb. The idea was to adjust each carburetor so the sound to your ear was the same for each carb. With practice it is possible to be quite accurate, but it does take practice.
