Applicable for GY6 QMB139 50cc Chinese Scooter Moped ATV, such as Taotao, Sunl, etc... GY6 50CC High Performance Clutch Set Package includes: 1 x Clutch Assembly 1 x Variator Assembly, 1 x 669 Belt Clutch:
Number of Splines (clutch bell): 22
Outer Diameter (pulley): 119mm
Outer Diameter (clutch bell): 115mm
Inner Diameter (clutch bell): 107mm
Inner Diameter (clutch): 12mm
Uses 6901-RS bearing Clutch Bell
Inner Diameter (splines peak to peak): 11mm

Variator:
Drive face center hole: 26 teeth [spline shaft]
Drive face hole diameter: 14mm [.55"]
Drive face diameter: 9.06cm [3.57"]
Variator face diameter: 8.77cm [3.45"]
Roller width: 13mm [0.5"]
Roller OD: 16mm [0.63"]
Roller ID: 9.45mm [0.37"]
Drive face is plastic with a notch/tab metal gear for the spline shaft

Belt
Belt size: 669 mm Length x 18 mm Width x 30 mm teeth spacing