Operation of the Choke Circuit

Don't choke!

Don’t choke!

a. The choke circuit supplies a ready means of restricting the amount of air passing through the carburetor. This restriction and resulting rich mixture is necessary when starting and warming a cold engine.

b. Chokes are of two types; manual and automatic.  The WO Carburetors described herein employs the manual type. The manual choke mechanism  in the conventional carburetor consists of a valve mounted on shaft in the air horn of the carburetor, operated by an external lever attached to the shaft. Manual operated choke valves of this type usually have a semi-automatic feature which prevents over-choking after starting. This feature is accomplished by spring-loading, either all or half of the valve, or by incorporating a spring-loaded poppet device in the valve. Some models use both means to improve choke action.

You can find out more about the WW2 jeep inner workings with this book – The Complete WW2 Military Jeep Manual.