GY6 50cc (139QMB) Cylinder Head - Emissions

GY6 50cc Cylinder Head for 139QMB Engines

The GY6 50cc Cylinder Head is designed specifically for 50cc 4-stroke QMB139 engines, featuring an advanced emissions control system known as PAIR, which stands for Pulsed Secondary Air Injection System. This component helps to reduce hydrocarbon (HC) and carbon monoxide (CO) emissions by directing air into the exhaust flow. It is one of the key GY6 50cc scooter parts that ensures your engine runs cleaner and more efficiently.

Emissions Control System

This cylinder head incorporates the PAIR system, which plays an important role in minimizing harmful emissions from your scooter. By introducing fresh air into the exhaust, the PAIR system improves combustion efficiency and helps to meet environmental standards. This feature is important for owners looking to reduce their environmental impact while maintaining engine performance.

Specifications and Dimensions

The GY6 50cc Cylinder Head features precise dimensions that ensure a perfect fit for your engine. It has a bore size of 39mm, with an intake port diameter of 17mm and an exhaust port diameter of 18mm. These specifications are necessary for maintaining the correct balance of air and fuel, which is important for engine performance.

Specifications

• Size: 39mm Bore
• Intake Port Diameter: 17mm
• Exhaust Port Diameter: 18mm
• Emission Control System: Pulsed Secondary Air Injection (PAIR)
• Fits: QMB139 50cc/49cc Engines

Fitment

This cylinder head is compatible with various makes and models that utilize the QMB139 engine. Ensure your scooter is equipped with a 50cc 4-stroke engine to benefit from this replacement part.

• Various makes/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