GY6 50cc (139QMB) Cylinder Head - Emissions
ITEM# TT-16007
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Description
GY6 50cc Cylinder Head Built for 139QMB Engines
This GY6 50cc Cylinder Head suits 50cc 4-stroke QMB139 engines and uses a PAIR emissions setup, short for Pulsed Secondary Air Injection System. The system pushes air into the exhaust stream to cut down on hydrocarbon (HC) and carbon monoxide (CO) output. It's one of the GY6 50cc scooter parts that helps your engine run cleaner and more efficiently.
Emissions Control System
This head includes the PAIR system, which helps limit harmful exhaust output from your scooter. Adding fresh air to the exhaust supports more complete combustion and helps meet emissions standards. It's a useful feature for riders who want to lower their environmental footprint without giving up engine performance.
Specifications and Dimensions
The GY6 50cc Cylinder Head is machined to exact measurements so it lines up properly with your engine. It has a 39mm bore, a 17mm intake port diameter, and an 18mm exhaust port diameter. Getting these dimensions right matters for keeping the air-fuel mixture balanced, which directly affects how the engine performs.
Specifications
- Size: 39mm Bore
- Intake Port Diameter: 17mm
- Exhaust Port Diameter: 18mm
- Emission Control System: Pulsed Secondary Air Injection (PAIR)
- Fits: Universal GY6 50cc QMB139 4-stroke engines with PAIR emissions cylinder head
Fitment
Fits:
- Universal QMB139 50cc/49cc 4-stroke engines (PAIR emissions style, 39mm bore)
How to choose: Confirm your engine has a 39mm bore and the QMB139 designation, and verify it uses a PAIR emissions system before ordering.
Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Cylinder Heads & Valves · Scooter Parts
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