50cc Scooter Engine Parts/139QMB/QMA GY6 50cc Engine(139QMB) Engine parts diagramme and List. PART NO.ENGLISH NAMEGY6-50C4C-01BOLT,ALL SCREW HEXAGON HEAD GY6-50C4C-02HEAD COVER,CYLINDER HEADGY6-50C4C-03NUT,HEXAGON FLANGE ANTISLIP FHLM M6GY6-50C4C-04WASHER.FLAT GB/T97.1 Φ6*13*2GY6-50C4C-05SWING ARM ASSYGY6-50C4C-06TIMING GEAR,CAMSHAFTGY6-50C4C-07PIPE,AIR INJECTIONGY6-50C4C-08INSULATORGY6-50C4C- ...