A Motorcycle Carburetor Carb Balancing Auxiliary is a tool used to balance the air/fuel mixture in the carburettors of a motorcycle. It is used to synchronize the carburettors, which ensures that each cylinder is getting the same amount of fuel, resulting in a more efficient and smoother running engine. This tool typically consists of a series of hoses, tubes, and gauges that connect to the carburettors and allow the technician to measure and adjust the air/fuel mixture.
Some designs can be screwed in place of the carburettor’s air filter and others can be connected to the carburettor’s vacuum port. In general, it’s a device that helps to fine tune the carburettor for better performance and optimal fuel economy.