Automatic Choke
Control of additional fuel and air quantity during warm up of engine is by a heat sensitive expanding element which is warmed or cooled by engine coolant. As coolant temperature decreases, the injected fuel quantity increases; and as temperature increases, the fuel quantity decreases. The expanding element does this by changing the position of an eccentric shaft which acts on the control cam actuated rocker. The air supply is reduced accordingly with the aid of an air regulating cone.