Chinese 50cc GY6 50cc (139QMB) Complete Engine Gasket Set

Full Gasket Kit for GY6 50cc 4-Stroke Engines

This complete engine gasket kit suits GY6 50cc 4-stroke engines, including the QMB139 model. It supplies every seal and gasket needed for a full engine rebuild, whether you are servicing the top end or opening the crankcase. The kit is one of the essential GY6 50cc scooter parts for stopping leaks and bringing back proper engine compression.

What Is in the Kit

The set covers a range of engine areas. Included are case gaskets for the crankcase and the stator/magneto cover, plus top-end sealing pieces such as the cylinder head gasket, base gasket, and valve cover gasket. The kit also contains a CVT cover gasket, a crush-type exhaust gasket, and an O-ring for the intake manifold spacer.

Preparing for Installation

Clean every mating surface and remove all traces of old gasket material before fitting the new parts. Careful preparation helps prevent leaks and gives a firm seal. The kit works with both short and long case engines, so pick the correct size to match your engine.

Specifications

• Material: High-density gasket material
• Position: Engine case, top end, CVT, exhaust, and intake
• OEM Part Number: 139QMB
• Fits: GY6 50cc 4-stroke QMB139 engines (1P39QMB), in 44mm or 48mm bore and short or long case sizes

Fitment

Fits:

• GY6 50cc 4-stroke QMB139 / 1P39QMB engines (44mm bore, stock 50cc, short case or long case)
• GY6 50cc 4-stroke QMB139 / 1P39QMB engines (48mm bore, 72cc or 80cc big bore kits, short case or long case)

How to choose: Select the bore size that matches your cylinder: 44mm for a stock 50cc engine, or 48mm for a 72cc or 80cc big bore kit. Select the case type by measuring the CVT cover: Short Case (SC) measures 15 11/16" (398mm) and uses 8 bolts, while Long Case (LC) measures 17" (432mm) and uses 11 bolts.

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