The two wires that go into the carburetor are the kill-switch: when those wires touch each other, the ignition is short-circuited and the engine stops. Unless there is some other ignition fault, if you pull both wires out and separate them, there should be spark at the spark plug when you pull the start rope. The socket and boot are the rubber parts that are pushed into the carburetor, to hold the two wires the correct distance apart so that they only touch when you put the speed control in the "Stop" position.