39mm QMB139 engine Kit w/ Head(69mm-EGR PAIR)

39mm QMB139 Engine Kit with 69mm EGR PAIR Cylinder Head

Boost your GY6 50cc scooter or ATV with this comprehensive 39mm QMB139 engine kit, featuring an upgraded cylinder head designed for enhanced performance. This kit provides the core components for a significant displacement increase, bringing new life to your engine.

• 39mm Bore Cylinder Kit: Delivers increased displacement for greater power output.
• 69mm Valve Cylinder Head: Equipped with larger 69mm valves for improved airflow and combustion efficiency.
• EGR PAIR Style Head: Designed in the EGR (Exhaust Gas Recirculation) PAIR configuration for specific emissions compliance or performance tuning.
• Piston Kit with 13mm Pin: Includes a precisely machined piston and a 13mm piston pin for reliable operation.
• High-Quality Gaskets: Comes with a complete CVT case gasket set tailored for the 39mm bore cylinder.

This 39mm engine kit represents a substantial upgrade over stock 50cc configurations, offering a noticeable power gain. Compared to standard 39mm bore kits, this package includes a performance-oriented cylinder head, ensuring that the increased displacement is efficiently utilized, setting it apart from basic big bore kits that might not optimize airflow.

Key Technical Advantages: Technology and Performance

This kit leverages a larger bore and advanced cylinder head design to maximize the potential of QMB139 and GY6 50cc engines. The integration of 69mm valves within the EGR PAIR cylinder head allows for superior gas exchange, leading to increased horsepower and torque. Precision-engineered components ensure durability and optimal function for riders seeking enhanced acceleration and top speed.