The function of the distributor is to distribute the high-voltage electricity generated by the ignition coil to the spark plugs of each cylinder according to the requirements of the engine ignition sequence. The distributor consists of distributor cover and distributor. There is a center electrode and several side electrodes on the distributor cover, and the number of side electrodes is equal to the number of engine cylinders. The distributor is mounted on the extension shaft of the breaker cam and rotates together with the distributor. During the working process of the engine, when the split burner is connected to a certain side electrode, the high-voltage electricity generated in the secondary winding of the ignition coil is sent to the side electrode through the center electrode, split burner, side electrode and high-voltage wire on the distributor cover. The spark plug of the connected cylinder. The function of the capacitor is to reduce the spark generated between the contacts at the moment when the contacts of the circuit breaker are separated. It is mounted on the distributor housing in parallel with the breaker contacts. The function of the ignition advance adjustment device is to automatically adjust the ignition advance angle according to the changes of the engine operating conditions when the engine is working. It consists of two sets of centrifugal and vacuum ignition advance adjustment devices, which are respectively installed under the bottom plate of the circuit breaker and on the shell of the distributor.