QMB139 50mm Big Bore Cylinder Kit

Upgrade your QMB139 scooter's engine with this high-performance 50mm Big Bore Cylinder Kit, designed for enhanced power and efficiency. Featuring a non-EGR design and a substantial 69mm valve, this kit is engineered for riders seeking a significant boost in performance for their 50cc 4-stroke engine.

• 50mm Cylinder Bore: Expands displacement for increased power output.
• 69mm Valve Size: Facilitates superior airflow, crucial for maximizing engine performance and throttle response.
• Non-EGR Design: Eliminates emissions control for a more direct, potent power delivery.
• Complete Piston Set: Includes piston, rings, pin, and circlips for a ready-to-install solution.
• High-Quality Gaskets: Comes with cylinder head, base, and left CVT cover gaskets for a proper seal.

Compared to standard 50cc configurations, this 50mm kit dramatically increases the engine's potential, often allowing for displacements up to 81.3cc with compatible components. Its design prioritizes raw performance, offering a noticeable improvement over stock engines or previous iterations that may have included EGR systems.

Key Technical Advantages: Technology and Performance

This cylinder kit leverages advanced design principles to deliver superior technology and performance. The 50mm bore paired with the capacious 69mm valve creates an optimal combustion chamber, translating directly into increased horsepower and torque. By opting for a non-EGR setup, the engine benefits from unhindered exhaust flow, pushing the boundaries of what a 50cc QMB139 engine can achieve.