HITACHI 4-Barrel Carburetors: Description

Carburetor is of 4-barrel, 2-stage design. Primary stage includes idle system, slow speed circuit, accelerator pump system and main metering system. Fluid from sub-zero starting device, if equipped, and oil from metering oil pump is admitted into primary stage. Secondary stage contains secondary vacuum diaphragm operating system, stepping circuit, and main metering system.

Some manual transmission vehicles are equipped with an electric idle switch, coasting richer valve, and a dashpot with dashpot delay valve. Some California vehicles are equipped with a choke return diaphragm, choke return delay valve, and choke delay valve.