In the ignition system of a motorcycle gasoline engine, the ignition coil is used to convert the low-voltage electricity into a high-voltage electricity, so that the spark plug generates an electric spark. There are many types of ignition coils. The ignition coil is mainly composed of a primary winding, asecondary winding, a core, and an outer casing. Both the primary winding and the secondary winding are wound around the core. The number of turns of the primary winding is small, the working current is large;the number of turns of the secondary winding is large, and the working voltage is large, generally above 10000V.