Scooter Variator Roller Set 16x13mm 4g 4.5g 5g 5.5g 6g 6.5g 7g For Baotian BT49QT GY6 50cc 139QMB 139QMA 4-Stroke
Amazon.com: 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 : Automotive
ScooterWest.com - 19X15.5MM 19 X 15.5 MM 19X15,5 roller set 50cc