GY6 50cc (139QMB) Non Emissions Head - 69mm Valves
ITEM# TT-15691
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Description
Non-Emissions Cylinder Head for GY6 50cc and 80cc Engines
This non-emissions head suits GY6 50cc and 80cc engines, specifically the 139QMB and 139QMA models. It is a practical replacement for owners who want to keep or raise the performance of their off-road scooters. Listed among GY6 50cc scooter parts, it arrives fully assembled, so fitting it is simple. Whether you are swapping out a worn component or upgrading your engine, this part is made to handle the job.
Construction and Features
The cylinder head uses a 4-bolt deck pattern and includes valves measuring 69mm in length. Because it has no secondary air port, it is intended for non-emissions setups. The intake port measures 17mm across and the exhaust port 18mm, which supports steady airflow during engine operation.
Installation and Replacement
Valves, springs, and retainers come already fitted, which cuts down on the work involved in replacing the head. It bolts onto compatible engines without requiring extra modifications. If you notice problems such as lost power or louder engine running, a replacement may be needed.
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
- Fits: GY6 139QMB/139QMA 50cc and 80cc 4-stroke engines (non-emissions, no secondary air port)
Fitment
Fits:
- 139QMA engines (non-emissions)
- 139QMB engines (non-emissions)
- 1P39QMB and 1P39QMA-2 engines
- YN139QMB, JJ1P39QMB, BD1P39QMB and BN139QMB engines
- 139FMA-2 engines
- 147QMD engines
- Other QMA and QMB models (non-emissions)
How to choose: Compare your engine code with the list (stamped on the engine case) and confirm your engine has no secondary air port before you order.
Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Cylinder Heads & Valves · Scooter Parts
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