Upgrade Your Ride: 80cc QMB139 Big Bore Cylinder Engine Kit

This comprehensive 80cc QMB139 cylinder engine kit is engineered to significantly boost the performance of your GY6 50cc scooter or ATV. Featuring a 47mm bore and a high-flow Non-EGR cylinder head, this kit provides a substantial increase in displacement and power.

• 47mm Piston Diameter ensures increased displacement for enhanced torque and acceleration.
• 69mm Valve Length on the Non-EGR cylinder head allows for improved airflow into and out of the combustion chamber.
• Non-EGR Cylinder Head design simplifies installation and can contribute to a cleaner burn, optimizing performance.
• 13mm Piston Pin Diameter provides robust connection for reliable engine operation under increased load.
• 17mm Intake Port Diameter on the cylinder head facilitates greater air-fuel mixture intake for more power output.

Compared to standard 50cc GY6 engines, this 80cc big bore kit represents a major leap in performance. While stock engines are designed for basic commuter needs, this upgraded kit transforms your vehicle's capability, offering noticeably quicker acceleration and higher top speeds suitable for enthusiasts seeking more power for spirited riding or demanding terrains.

Key Technical Advantages: Technology and Performance

The integration of a 47mm piston within the QMB139 platform, combined with a precisely designed 69mm valve cylinder head, maximizes the engine's volumetric efficiency. This synergy allows for a more potent combustion cycle, translating directly into tangible gains in engine responsiveness and overall power delivery. The Non-EGR configuration further streamlines the system, focusing on raw performance output.