GY6 Cover Assembly, Cylinder Head

GY6 Cylinder Head Cover Assembly for 125-150cc Engines

This head cover assembly is built for 125-150cc GY6 engines. It forms the connection between the carburetor and the engine cylinder and includes two vacuum ports. As one of the frequently needed GY6 scooter parts, it plays a direct role in keeping the engine running properly. Checking it now and then, and swapping it out when needed, can help head off problems that develop from wear.

Construction and Function

Every component pictured in the product images comes with this assembly, so you get everything needed in one package. It is shaped to suit the specific layouts of GY6 engines, giving a dependable link between the carburetor and the cylinder head. Before fitting it, look over the intake manifold for any damage.

When to Replace

Replacement is common with this piece because it serves as the main mounting surface for the carburetor. Over time, regular use may cause wear, and if the material breaks down, leaks can follow. Looking at this part on a regular basis can help you catch issues affecting air and fuel flow early.

Specifications

• Inner Diameter (head side): 22mm
• Inner Diameter (carb mount): 30mm
• Bolt Hole Spacing: 45mm
• Includes: O Ring
• Fits: GY6 150cc (157QMJ) engines, and 125-169cc 157QMJ-based GY6 engines per the engine code list

Fitment

Fits:

• GY6 150cc (157QMJ)
• GY6 125cc and 169cc engines based on 157QMJ (engine codes 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A)
• Other QMJ, QMK and QMI GY6 engines (engine code containing QM or FM)

How to choose: Compare the engine code stamped on your engine case with the codes above. Any code that includes QM or FM is considered compatible.

Where it goes: Refer to part #1 on the cylinder head cover diagram for the GY6 150cc (157QMJ).

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