Carburetor - KEIHIN: Description: Notes

Carburetor is a downdraft design. Carburetor contains 2 systems, primary and auxiliary. Primary system utilizes primary and secondary venturi, float system, accelerator pump system, and an idle system. Auxiliary system utilizes an auxiliary venturi with a float and idle system. Auxiliary system provides fuel to the pre-combustion chamber.

Carburetor components include electrically-heated automatic choke, choke opener diaphragm, secondary throttle opener diaphragm, fuel shut-off solenoid, primary/secondary main fuel cut-off solenoid, primary slow mixture cut-off solenoid, fast idle unloader and air jet controller (Calif. and high altitude models).

The air jet controller (AJC) is an atmospheric pressure sensing device, controlling the amount of air flow into slow and main air jets of auxiliary carburetor and secondary slow air jet of main carburetor.

Both choke valve setting and fast idle position are controlled during engine warm-up by automatic choke. It consists of bi-metallic coil, heater and thermistor in choke cover; a 5 ohm resistor located on firewall on Civic and on air cleaner on Accord; air intake sensor located in air cleaner assembly; thermovalve in the distributor housing and choke opener and fast idle unloader diaphragms on outside of carburetor.