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°.

A thermostatic valve provides airflow under secondary throttle valve, when ambient air temperature is high, to maintain proper combustion. Other features include a choke opener, a main and an auxiliary accelerator pump (AAP), a secondary slow circuit fuel cut system, a fast idle cam breaker, a deceleration fuel cut system, outer vent control valve and idle-up diaphragm.