The Honda 30500-ZE2-003 Ignition Coil Assembly generates the high voltage needed to create a spark at the engine's spark plug. It converts electrical energy from the ignition system into the voltage required to ignite the compressed air-fuel mixture inside the combustion chamber. Proper coil operation supports engine starting and consistent combustion. Replacing a faulty ignition coil... https://www.wholetoolbox.com/honda-30500-ze2-003-ignition-coil-assembly/30500-ZE2-003.html