Automatic Choke System: Operation
When 2T-C or 4M engines are started, current from regulator turns choke relay on, allowing current to flow through choke heat coil. This causes choke heater to heat and open choke by means of bimetallic spring. The choke breaker diaphragm holds choke valve slightly open to prevent over choking. A temperature sensitive resistor develops a higher resistance as it is heated, this serves to limit current flowing through choke cap heater.