44MM QMB139 Big Bore Engine Kit with 69mm Non-Emission Head

Boost your scooter's performance with this comprehensive 44mm Big Bore engine kit, specifically designed for QMB139 engines. This kit features a high-performance cylinder head with a 69mm valve and a non-emission design, engineered to deliver significant power gains and improved throttle response.

• 44mm Bore Cylinder: Increases engine displacement for enhanced power output.
• 69mm Valve Cylinder Head: Features larger intake (17mm) and exhaust (18mm) ports for superior airflow.
• Non-Emission (Non-EGR) Design: Streamlined for maximum performance and easier tuning.
• Included Piston Kit: Precisely sized 44mm piston with a 13mm pin for a perfect fit and reliable operation.
• Complete Gasket Set: Ensures a leak-free seal for the 44mm bore, vital for optimal engine function.

Compared to standard 50cc GY6 engines, this 44mm big bore kit offers a substantial increase in torque and horsepower, elevating your riding experience. Its non-emission design removes restrictive EGR components, allowing for more efficient combustion and potentially higher peak RPMs than older or emissions-compliant models.

Key Technical Advantages: Technology and Performance

This kit integrates advanced engineering for noticeable performance enhancements. The larger bore and valve dimensions work in synergy to improve volumetric efficiency, while the non-emission cylinder head simplifies installation and tuning for enthusiasts seeking maximum output from their QMB139 platform.