GY6 150cc (157QMJ) Engines Cylinder Head 57mm
ITEM# TT-26794
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Description
57mm Cylinder Head for GY6 150cc Engines
This cast aluminum cylinder head is built for GY6 150cc engines, namely the 157QMJ models. It serves as a dependable swap-in for a cylinder head that has been damaged or has worn down. Keeping this part in good condition matters for overall engine performance. It is one of the simpler GY6 150cc scooter parts you can fit yourself at home.
Construction and Features
This head is manufactured to OEM specifications and has a 57.4mm bore diameter. Valve seats and guides come already fitted, which simplifies the installation process. Both the intake and exhaust ports measure 24mm and use M6 threaded connections. The design is meant to work with a range of GY6-A block engines.
When to Replace Your Cylinder Head
If your engine begins to overheat or loses power, it may be time to inspect or replace the cylinder head. Leaving a damaged or worn head in service can cause significant engine damage. Swapping it out quickly can bring back both performance and dependability.
Specifications
- Material: Cast Aluminum
- Bore Diameter: 57mm (57.4mm)
- Intake Port Diameter: 24mm
- Exhaust Port Diameter: 24mm
- Port Threads: M6
- Valve Seats: Pre-installed
- Valve Guides: Included
- Country of Origin: China
- Fits: GY6 150cc (157QMJ) engines with a 57mm bore, including 157QMJ, JJ157QMJ, 1P57QMJ and BN157QMJ codes
Fitment
Fits:
- GY6 150cc (157QMJ) (57mm bore, 157QMJ, JJ157QMJ, 1P57QMJ and BN157QMJ codes)
- Other 157QMJ-based 150cc engines with a 57mm bore (listed as other QMJ models)
- 152QMI 125cc/150cc GY6-A engines (listed in the features)
How to choose: Check that your bore is 57mm and that the engine code stamped on your motor matches one of these: 157QMJ, JJ157QMJ, 1P57QMJ or BN157QMJ. Confirm this before placing your order.
Where it goes: It is part #1 on the cylinder head diagram for the GY6 150cc (157QMJ).
Other versions: For a Genuine GY6 125cc head with valve guides, see Cylinder Head (With Valve Guides) for Genuine, GY6 125 cc. For GY6 171cc big valve kits at 61mm, see GY6 Big Valve Cylinder Head - 61mm 171cc Kits. For a Genuine/GY6 big valve head at 58.5mm with 2 valves, see Genuine/GY6 Big Valve Cylinder Head (58.5mm, 2 Valve).
Shop more: GY6 150cc Scooter Parts (157QMJ) · GY6 Scooter Parts · Scooter Cylinder Heads & Valves · Scooter Engines & Engine Parts · Scooter Parts
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