39mm QMB139 Engine Kit with 64mm Non-Emission Head

This comprehensive 39mm QMB139 engine kit is engineered for 50cc 4-stroke GY6 engines, featuring a high-performance non-emission cylinder head with 64mm valves. It's designed to upgrade power and efficiency for a wide range of scooters, ATVs, and go-karts.

• 39mm Bore Cylinder: Provides increased displacement for enhanced power output and torque from your QMB139 engine.
• 64mm Valve Size: Features larger intake and exhaust valves within the cylinder head for improved airflow and combustion efficiency.
• Non-Emission (Non-EGR) Cylinder Head: Optimized for performance by removing emissions control components, allowing for a cleaner burn and higher power potential.
• 13mm Piston Pin Diameter: Ensures robust connection and durability for the piston within the cylinder assembly.
• 17mm Intake Port Diameter: Facilitates a strong volume of air-fuel mixture entering the combustion chamber, crucial for performance gains.

Compared to standard 50cc GY6 engines, this 39mm big bore kit offers a significant performance uplift. It bypasses the complexities of emission control systems, focusing purely on maximizing power and responsiveness for riders seeking an edge. This kit provides a direct upgrade path for those looking to surpass the limitations of factory-spec engines.

Key Technical Advantages: Technology and Performance

This engine kit integrates advanced design principles to deliver superior performance. The precision-machined 39mm bore and large 64mm valves promote optimal gas exchange, while the non-emission cylinder head design streamlines combustion for increased horsepower. Combined with other compatible GY6 performance components, this kit empowers your vehicle with exhilarating acceleration and sustained power.