Description
Non-Emissions Cylinder Head for GY6 50cc and 80cc Engines
This non-emissions head is designed for the GY6 50cc and 80cc engine types, specifically the 139QMB and 139QMA models. It provides an excellent replacement option for those looking to maintain or improve the performance of their off-road scooters. As one of the GY6 50cc scooter parts, this head comes fully assembled, making installation straightforward. Whether you're replacing a worn-out part or upgrading your engine, this component is built to meet your needs.
Construction and Features
This cylinder head features a 4-bolt deck pattern and is equipped with valves that measure 69mm in length. The head has no secondary air port, making it suitable for non-emissions applications. The intake and exhaust ports have diameters of 17mm and 18mm, respectively, ensuring proper airflow for effective engine operation.
Installation and Replacement
With all components such as valves, springs, and retainers pre-installed, this head simplifies the replacement process. It fits directly onto compatible engines without the need for extra modifications. Regular replacement may be necessary if you notice performance issues, such as reduced power or increased engine noise.
Specifications
- Engine Type: 139QMB / 139QMA 4-stroke 50cc / 80cc
- Style: Non-emissions (no secondary air port)
- Condition: Fully assembled
- Valve Length: 69mm
- Valve Center-to-Center Spacing: 70.5mm
- Intake Port Diameter: 17mm
- Exhaust Port Diameter: 18mm
- Deck Pattern: 4-bolt
Fitment
This cylinder head is compatible with various engines based on the 139QMB platform. It fits the following engine codes:
- 139QMA
- 139QMB
- 1P39QMB
- 1P39QMA-2
- YN139QMB
- JJ1P39QMB
- 139FMA-2
- BD1P39QMB
- BN139QMB
- 147QMD
- Other QMA models
- Other QMB models
Not sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.
Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Cylinder Heads & Valves · Scooter Parts
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