GY6 50cc (139QMB) Cylinder Gaskets (50 mm)

Replacement Cylinder Gasket for GY6 50cc Engines

This cylinder gasket is built for the GY6 50cc engine code (139QMB) and is sized for a 50mm big bore kit, part #1100-1237. It helps restore compression or supports a larger engine displacement. It's a useful item among the GY6 50cc scooter parts available for performance work.

What This Part Does

The cylinder gasket seals the joint between the cylinder and the engine case, which keeps compression where it belongs. A sound seal supports steady, efficient running. Fitting a new one when you install a big bore kit helps the components line up correctly and can contribute to better power output.

Specifications

• Size: 50 mm
• Position: Cylinder
• Fits: GY6 50cc 139QMB engines with 50 mm big bore kit (NCY BBK #1100-1237)

Fitment

Fits:

• GY6 50cc 139QMB engine (with 50 mm big bore kit)
• NCY 50mm big bore kit #1100-1237

How to choose: Confirm the bore before buying. This set is made for a 50 mm big bore on a 139QMB, so measure your cylinder and make sure it is 50 mm.

Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Big Bore & Cylinder Kits · Scooter Gaskets & Seals · Scooter Parts