GY6 67mm 4V Cylinder Head

GY6 67mm 4V Cylinder Head for B-Case Engines

This 67mm (232cc) cylinder head for GY6 4-stroke engines with a B-case layout is a dependable performance option for your scooter. The kit comes with a camshaft, roller rockers, and anodized head and cam covers, so you get a full set of parts for the top end of your engine. Among GY6 scooter parts, it suits riders who want more power and steadier running. It is designed to work with a variety of makes and models.

Key Features

The head uses a 23mm exhaust valve and a 25mm intake valve, which support smooth airflow and better combustion. Its exhaust port measures 27mm and its intake port 30mm, helping exhaust gases leave and fresh charge enter more easily. At 144mm overall height, it is sized for B-case engines with 57mm stud spacing.

Installation Notes

A 96L cam chain is needed to fit this head. The chain is not included. Set valve lash to 0.10mm on the intake side and 0.12mm on the exhaust side, as these clearances matter for proper engine operation. This part is intended for off-road use only and is not suitable for public roads or land.

Specifications

• Exhaust Valve Diameter: 23mm
• Intake Valve Diameter: 25mm
• Exhaust Port Diameter: 27mm
• Intake Port Diameter: 30mm
• Overall Height: 144mm
• Stud Spacing: 57mm
• Fits: GY6 B-case four-stroke engine builds with 57mm stud spacing and a 67mm cylinder (232cc build)

Fitment

Fits:

• GY6 QMI/QMJ 152/157 engine families (B-case build with 57mm stud spacing and compatible 67mm cylinder configuration)
• Other compatible makes and models (same B-case, stud-spacing, cylinder, and valvetrain requirements)

How to choose: Check the cylinder stud spacing on your engine. This head needs 57mm. You will also need a 96-link cam chain, which is sold separately.

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