This high quality accessory is the lightweight variator for 50cc GY6 QMB139 Engines from NCY NCY is well known in the competitive riding market as the brand to use when modifying your ride 30 Day Warranty Description This high quality accessory is the lightweight variator for 50cc GY6 QMB139 Engines from NCY. NCY is well known in the competitive riding market as the brand to use when modifying your ride. Let Monster Scooter Parts be your first source for accessories and mods from NCY with our great lightweight variator. This may just be the ultimate variator for your GY6 transmission. Lighter than any other variator on the market, and it is ideal for just about any and all types of scootering. The Teflon coated roller tracks prevent road dirt, grit, dust, mud, and snow from accumulating and causing the roller weights to develop flat spots. This variator gives your scooter an extended roller weight life and consistently smooth transitions. Requires 18 mm x 14 mm roller weights. With its 89 mm drive face diameter, it still only weighs a mere 5-1/4 oz. 1200-1050 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