NCY Performance CDI (AC, 6 Pin); GY6, QMB139 This NCY performance scooter CDI igniter module works on most current AC GY6 50cc/150cc scooters made in China using the 139QMB/157QMJ engine. Higher voltage output, aggressive mapping as well as the removal of your rev limiter make this ideal for custom builds, or just simply trying to get a few more MPH's. A billet aluminum case protects this from road debris. The system voltage is raised up to 400-600 Volts by a transformer inside the scooter CDI module. NOTE: This part is for off-road use on ly and carries NO WARRANTY. USE AT YOUR OWN RISK. Brand: NCYFits: Most AC GY6 50/150cc Scooters using the Chinese 139QMB/157QMJ EngineSize: 6 pin Please be sure to confirm the connector design will match and that you have an AC ignition system before ordering.