50mm Big Bore Cylinder Piston Kit Fits For GY6 50cc Scooter Moped 139QMB 1P39QMB 50mm Big Bore Cylinder Kit W/ Assembled Head For 50cc Scooters 139QMB & 1P39QMB Big Bore Cylinder Piston -
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Amazon.com: 100cc Big Bore Kit GY6 49CC 50CC 139QMB Moped Scooter Engine 50mm Bore Upgrade Set Cylinder Only : Automotive
Dwcx 47mm Big Bore Kit Cylinder Piston Rings Fit For Gy6 50cc To 80cc 4 Stroke Scooter Moped Atv With 139qmb 139qma Engine - Engines & Engine Parts - AliExpress
50cc 100cc Big Bore Cylinder Piston Kit for GY6 Scooter Moped 139QMB 1P39QMB | eBay