Glixal ATMT1-147 GY6 High Performance Racing Blue CDI Box 50cc 125cc 150cc 139QMB 152QMI 157QMJ Chinese Scooter Moped Go Kart ATV Quads No Rev Limit AC-fired and NO REV LIMIT Material of body: Alloy Connector: 2+4 Pin Reset the ignition advance curve for better acceleration.