The contact breaker (points) ignition system The purpose of the ignition system is to ignite the combustion mixture in each cylinder at the precise time. To achieve this, the following parts listed, and shown in the below diagram are connected together: Image from my personal service manual collection, diagram of 1959-1978 Harley Davidson Sportster ignition system. 2 stroke ignition coil wiring diagram An ignition coil produces a high voltage output on its secondary when the current flowing in the Rprimary consists of the total resistance of the wire in the primary coil, as well as the resistance of the wires Refer to the internal diagram of the part shown below to see how the internal protection isC3 Oil Level Spark Switch Plug Ignition System Troubleshooting No Spark At Spark Plug How to test and repair ignition system problems? | Briggs The ignition system is the starting system for your small engine. Whether you start the engine with a pull rope or the turn of a key on an electric start motor, you're relying on the ignition system to produce a spark inside the combustion chamber.