GY6 57mm Cylinder Head - PAIR Type
ITEM# TT-16319
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Description
57mm Cylinder Head for GY6 150cc Engines
This 57mm PAIR cylinder head is made for GY6 150cc engines and works as a full replacement when you are rebuilding your motor. It arrives fully assembled with the parts needed to swap out a damaged head. Using it means you can bring your engine back to working order without building everything from scratch. Thanks to its complete assembly and fit with the engine layout, it is one of the simpler GY6 scooter parts to install.
Ready-to-Fit Valve Setup
The head ships with its valve assembly already built up, so the intake and exhaust valves and their springs are in place. That keeps the install quicker and less involved during a rebuild. It is a useful option for anyone aiming to get more out of a GY6 engine.
PAIR Emissions Compatibility
The design accommodates the Pulsed Secondary Air Injection (PAIR) system, which cuts harmful emissions by feeding air into the exhaust stream. This helps with emissions compliance while keeping the engine running efficiently. On off-road machines without this system, the PAIR port can be blanked off during installation if needed.
Specifications
- Type: Complete emissions-type cylinder head
- Engine Platform: GY6-A four-stroke
- Primary Application: 150cc QMJ157
- Bore Size: 57 mm
- Overall Height: 60.5 mm
- Head-Stud Spacing: 54 mm
- Diagonal Head-Stud Spacing: 76.5 mm
- Diagonal Valve-Cover Bolt Spacing: 144 mm
- Intake Valve Diameter: 29 mm
- Exhaust Valve Diameter: 23.5 mm
- Emissions Feature: PAIR secondary-air system
- Included: Installed valves and springs; intake and exhaust studs
- Fits: GY6-A 150cc four-stroke engines (QMJ157 / 157QMJ) with 57 mm bore and PAIR provision
Fitment
Fits:
- GY6-A 150cc QMJ157 / 157QMJ (57 mm bore, 54 mm head-stud spacing, PAIR secondary-air provision)
- GY6 QMI/QMJ 152/157 applications (match bore, stud spacing and valve-cover bolt layout)
How to choose: Check that the engine code and dimensions line up with your current head: 57 mm bore, 54 mm head-stud spacing, 60.5 mm overall height.
Shop more: GY6 Scooter Parts · Chinese Scooter Parts · Scooter Cylinder Heads & Valves · Scooter Parts
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