Relay with 2 wires used on 4-stroke and 2-stroke engines equipped with electric start. Sometimes referred to as a starter solenoid.
This is a very common relay used in all sizes of full size scooters, atvs, go karts, and dirt bikes of engine sizes 50cc - 250cc. Including GY6 QMB139 style and other Chinese made gas 4-stroke engines.
Relays commonly used in the gas scooter industry. A relay is an electrical switch that opens and closes under the application of a second electrical circuit. In basic operation, the relay controls an output circuit of much higher power than the input circuit.
A relay allows the controls for the high power circuit to be made with lower capacity wiring and switches.