Carburetor - AISAN 2-Bbl: Description

Carburetor is a 2-barrel downdraft design with primary and secondary venturi. An automatic choke containing a bi-metallic spring, controlled by a ceramic heater, provides proper air/fuel mixture control during engine warm-up.

Secondary throttle valve is actuated by a vacuum diaphragm unit with a kick-up (open) lever. Secondary valve begins to open when primary throttle valve opening exceeds 50 degrees.