80cc QMB139 47MM Cylinder Engine Kit

Boost your scooter's performance with this essential 80cc QMB139 cylinder engine kit, designed as a direct upgrade for GY6 50cc engines. Featuring a 47mm bore and a specialized 69mm EGR cylinder head, this kit delivers a significant increase in power and torque for a more exhilarating ride.

• 47mm Bore Piston Kit provides a substantial displacement increase for enhanced power output.
• 69mm EGR Cylinder Head is engineered for optimized airflow and combustion efficiency.
• Included Gaskets ensure a secure and leak-free seal for reliable engine operation.
• High-Quality Components are built to withstand the demands of upgraded performance.
• Complete Engine Assembly Kit simplifies the upgrade process with all necessary parts included.

This 80cc big bore kit offers a noticeable improvement over standard 50cc GY6 engines, providing a more robust acceleration and higher top speed. It's an ideal choice for riders seeking more capability without a complete engine replacement, outperforming stock configurations with its expanded displacement and refined combustion chamber.

Key Technical Advantages: Technology and Performance

Engineered for enthusiasts seeking a palpable power upgrade, this QMB139 kit integrates a precisely machined 47mm piston with an EGR-style cylinder head. The larger bore, coupled with the head's optimized valve dimensions (17mm intake, 18mm exhaust) and specific porting, promotes superior air-fuel mixture and exhaust gas scavenging. This synergy translates directly into increased horsepower and torque, making your ride more dynamic and responsive, especially in acceleration and hill climbs.