For Scooter Atv Quad 139Qmb Gy6 50-80Cc To 100Cc 50Mm Big Bore Piston + Ring Kit

50Mm Big Bore Piston & Ring Set For Scooter Moped Atv Quad 139Qmb 1P39Qmb 147Qmd Gy6 50 60 80 Cc Upgrade To 100Cc 139Qmb 50Mm Big Bore Piston & Ring Set Piston Diameter (Bottom Side): 50Mm Piston Diameter (Top Side): 49.45Mm Piston Overall Height: 34.5Mm Pin Diameter: 13Mm Pin Length: 38.35Mm This Item Is Used For 4 Stroke Scooter/Atv 139Qmb Gy6-50/60/80 Cc (39Mm/44Mm/47Mm) Upgraded To Be 50Mm 100Cc.