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50cc Cylinder Kit GY6 139QMA/B for Sym Symply Pulse Scout Lexmoto FMR AJS Digita Crankshaft MuZ / MZ Mosquito RXCylinder kit 50cc for GY6, Kymco 4 stroke with piston and gasket Standard 50cc cylinder kit for scooters using Chinese GY6 50cc 4 stroke engine (139QMA & 139QMB). Kit is supplied with Cylinder Barrel, piston set (rings,pin,clips), gaskets. Fit for: Chinese 50cc 4 stroke (GY6 139QMA QMB engines) Kymco Agility 50cc 4T Peugeot V Clic Peugeot Vivacity ('08 on) 4 stroke AJS Modena 50 ZN50QT 27 Alisze FX50 50 CDI YY50QT 15(ALISZE Jazy 50 CDI YY50QT