Spark plug (plugs spark), commonly known as fire mouth. Spark plug of the role of the pulsed high voltage discharge high voltage wire fire mouth lines) sent, air between two electrode spark plug, resulting in electric spark this ignition cylinder gas mixture. The main types are: quasi type spark plug, spark plug, spark plug, spark plug, spark plug, spark plug, spark plug, etc.. Spark plug and ignition system and fuel supply system to make the engine work, to a large extent, together determine the performance of the engine.