GY6-Case 67mm Cylinder Head & Base Gasket Set

67mm Head and Base Gasket Kit for GY6 Engines

This kit is made for GY6 engines, especially those built on a B-Case design. With a 67mm inner diameter, it suits modified setups that run a big bore kit. Among the GY6 scooter parts available, it helps create a full seal so the engine can run efficiently and last longer. The materials are built to handle the higher heat and pressure found in modified engines.

Build Overview

The kit contains one head gasket and one base gasket, each cut to match the 57mm stud spacing found on GY6 B-Case blocks. The composite material resists heat well, which matters when riding hard. Together, these gaskets hold up under load, helping to prevent leaks and keep the engine running reliably.

Fit Check and Setup

This kit is intended only for 4-stroke GY6 engines with a B-Case layout, so verify the stud spacing before you fit it. Stock GY6 engines use 54mm spacing, so measure the center-to-center distance between the studs to confirm your engine is compatible. This kit suits anyone moving to a 67mm big bore setup who wants a straightforward fit.

Specs

• Gasket Inner Diameter: 67mm
• Cylinder Stud Spacing: 57mm center-to-center
• Kit Contents: 1x cylinder head gasket, 1x cylinder base gasket
• Engine Fitment: GY6 QMI/QMJ 152/157 (modified layouts)
• Fits: GY6 4-stroke QMI152/QMJ157 engines with B-Case block (57mm stud spacing) and 67mm big bore kits

Fitment

Fits:

• GY6 QMI152/QMJ157 (B-Case block, 57mm stud spacing, 67mm big bore)

How to choose: Measure the center-to-center distance between your cylinder studs. This kit requires 57mm; standard A-Case engines use 54mm.

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