Variator Assembly for gy6 50cc??Roller Size??16*13mm ??Fit GY6 QMB139 50cc Scooter Moped ATV You will get: 1*clutch Assembly 1*Variator Assembly 1* 669 belt, You only need to confirm the corresponding engine or model. These three parts are applicable in sets. High quality clutch:22 Splines Inside The Clutch Drum/Bell??ID of Spline Area: 12mm??OD of Drum: 115mm ID of Drum: 105mm??Fits GY6 50cc 4 Stroke 139QMB Engine With Short Case The Belt is made of high heat-resistant and high-strength materials??Belt key parameter 669x18x30, Premium belt provides longer durability for applications. Save your choice time: A clutch kit that meets your driveline needs eliminates the time and effort required to find the right model (and the risk of buying the wrong model). This brand new clutch bell assy is for GY6 50cc engine, the diameter of the bell with 6 holes is 4 1/2″. This Gy6 50cc clutch bell assy fits Gy6 50cc enginge of Mopeds and Scooters of Blade, Kinroad, Twister Hammerhead, Carter Talon, Dazon,