Related Photo Galleries
Every carburetor has a transfer slot in each bore with an idle circuit that allows the fuel to be pulled from the main metering circuit. Next to it (the round hole) is the idle discharge port. The trick is to have as little of the transfer slot exposed during idle by closing down the throttle plates. This provides more authority to the idle mixture screws. That is why it is a good idea to try different ignition timing settings so that the transfer slot area can be reduced.