GY6 50cc (139QMB) Cylinder Gasket Set (Replacement, 39mm)

Replacement Cylinder Gasket Set for GY6 50cc Engines

This cylinder gasket set is built for the GY6 50cc engine model 139QMB, which has a 39mm bore. Its job is to keep oil, fuel, and compression sealed in where they belong, so the engine runs as it should. It is one of the essential GY6 50cc scooter parts to swap out whenever the engine is opened up or when a leak appears. Confirm that the size and placement match your own engine so it seats correctly.

When to Replace It

Replace gaskets and oil seals each time you work on the engine, or as soon as you notice any sign of a leak. Maintaining these parts in good shape supports steady engine performance and helps prevent further damage.

Specifications

• Size: 39mm bore
• Position: Top-end
• Fits: GY6 50cc 139QMB engines with 39mm bore

Fitment

Fits:

• GY6 50cc 139QMB engine (39mm bore)

How to choose: Check that the bore matches your cylinder. This set is designed for a 39mm bore on a stock 139QMB top-end.

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