Suitable for 4-stroke & 2-stroke engines Suitable for 49cc to 250cc engines AKA starter solenoid 12 volt starter relay with 2 wires used on 4-stroke and 2-stroke engines equipped with electric start Sometimes referred to as a starter solenoid, this starter relay is universal in nature and is compatible with many models of gas scooters, full size scooters, ATVs, go-karts, and dirt bikes with 50cc to 250cc engines 30 Day Warranty Description 12 volt starter relay with 2 wires used on 4-stroke and 2-stroke engines equipped with electric start. Sometimes referred to as a starter solenoid, this starter relay is universal in nature and is compatible with many models of gas scooters, full size scooters, ATVs, go-karts, and dirt bikes with 50cc to 250cc engines. These include the GY6 QMB139 style as well as other Chinese made gas 4-stroke engines. This gas scooter part with a 10″ wire sports a 2-pin male connector. Baja 150 (BA150) ATV owners take note. This relay is for units with the VIN prefix LLCL. If your BA150 has a LLC Vin prefix, you will want the Starter Relay for Baja 49 (BA49) and Baja 150 (BA150) ATVs.