Automatic Temperature Control Air Cleaner: Description
All carbureted models are equipped with an Automatic Temperature Control (ATC) Air Cleaner assembly. This device maintains the temperature of the air entering the carburetor within a constant range, thereby providing a leaner air/fuel mixture to reduce harmful exhaust emissions. In addition, the ATC air cleaner improves engine warm-up characteristics and helps prevent carburetor icing. The ATC air cleaner assembly consists of an air cleaner housing, vacuum motor, temperature sensor, idle compensator, hot air duct, fresh air duct and various connecting hoses.