Glixal ATKS-041 High Performance Racing Variator Kit with 6.5 gram Roller Weights for Chinese Scooter Moped ATV 4-Stroke GY6 50cc 80cc 100cc 139QMB 139QMA Engine Front Clutch Variator Outer Diameter:89mm Variator Inner Diameter:20mm Bush Size: O/D:20MM; I/D:14mm; Length:38mm Roller Sets Weight: 6.5g Roller Weight Size: 16x13 mm