Electric Assist Choke: Operation

Current is constantly supplied to the temperature sensing switch. The system is grounded through a ground strap connected to the carburetor body. At temperatures below about 60°F the switch is open and no current is supplied to the ceramic heater located within the thermostatic spring, thus normal choking action occurs. But, at temperatures above 60°F, the temperature sensing switch closes and current is then supplied to the ceramic heater. As the heater warms, it causes the thermostatic spring to pull the choke plate open within 1 to 1.5 minutes.