Here is the bang for your buck Our high quality variator for 50cc GY6 QMB139 engines is from NCY 30 Day Warranty Description Here is the bang for your buck. Our high quality variator for 50cc GY6 QMB139 engines is from NCY. All in all, this is a very nice quality pulley by NCY for the GY6 50 engine. Let Monster Scooter Parts be your source for NCY scooter parts and accessories. 1200-1049 Compatibility Baja Motorsports Sun City 50 (SC50/SC50P/SC50QJ/SC50S) KYMCO Agility 50 KYMCO Like 50 KYMCO People 50 KYMCO People S 50 KYMCO Sento 50 KYMCO Sting 50 KYMCO Super 8 50 KYMCO Super 9 50 Roketa MC-01-50 Roketa MC-02B-50 Roketa MC-07-50 (Bahama 50) Roketa MC-10-50 (Maui 50 ST) Roketa MC-16-50 Roketa MC-17-50 (Sicily 50) Schwinn Laguna 50 Tank Urban 50 Tank Urban Classic 50 Tank Urban Econo 50 Tank Urban Sporty 50 Tank Urban Viaggio 50