Naraku Racing CDI No Rev Limiter for 50cc – 150cc 4-Stroke GY6 Scooters, ATVs, and Go KartsSPECIFICATIONS: 6-Pin ConnectionAC PulseTuning CDI unit with no rev limiter from Naraku. Derestricts your scooter and makes it revvier. Check the connectors in the product image for accuracy!NK390.05 delivers superior Naraku Performance for your GY6 engine. This Naraku Performance Scooter parts upgrade is meant for 50cc scooters with the GY6 50 engines also listed as 139QMB, QMB139, 1P39QMB, QMA139. It also works on select GY6 125cc and 150cc engines. See full list for the 152QMI (GY6-125) & 157QMJ (GY6-150) (QMI152 QMJ157) models and brands. Please check your plug connection before ordering this derestricted racing CDI. **