GY6 50cc 39mm Bore non-EGR cylinder head with 69mm valve

GY6 50cc 39mm Bore Non-EGR Cylinder Head with 69mm Valve

Upgrade your 50cc 4-stroke QMB139 engine with this fully assembled, non-EGR style cylinder head. Featuring a 39mm bore and 69mm valves, it's designed for optimal performance and direct replacement.

• 39mm Bore: Provides a larger displacement for increased power output compared to standard heads.
• 69mm Valve Length: Ensures efficient airflow for better combustion and engine responsiveness.
• 59.5mm Overall Height: Designed for precise fitment within the GY6 50cc engine architecture.
• 17mm Intake Port Diameter: Facilitates improved air-fuel mixture intake for enhanced performance.
• 18mm Exhaust Port Diameter: Optimized for rapid expulsion of exhaust gases, reducing backpressure.

This precision-engineered cylinder head offers a significant performance boost over stock or older EGR-equipped models. By eliminating the Exhaust Gas Recirculation (EGR) system, it reduces exhaust gas temperatures and allows for cleaner, more efficient combustion, leading to a crisper throttle response and potentially higher peak power. The larger bore and valve size are specifically chosen to maximize airflow and power potential for the popular 50cc GY6 platform.

Key Technical Advantages: Enhanced Performance and Efficiency

The non-EGR design, combined with the robust 39mm bore and 69mm valves, creates a high-performance setup that prioritizes power and efficiency. This cylinder head is built to deliver improved throttle response, smoother acceleration, and greater overall power output for your GY6 50cc scooter or ATV. Its direct-fit design ensures compatibility with QMB139 engines, making installation straightforward for enthusiasts looking to upgrade their engine's capabilities.