100cc QMB139 50mm Big Bore Cylinder Kit GY6 engine with 69mm Valves EGR Head

Upgrade Your GY6 100CC Engine with a 50mm Big Bore Cylinder Kit

Boost your scooter's performance with this comprehensive 100cc QMB139 Big Bore Cylinder Kit designed for GY6 engines. This kit replaces your stock 50cc components, significantly increasing displacement for enhanced power and acceleration.

• 50mm Piston Diameter: Features a precisely machined 50mm piston for a larger bore, increasing engine displacement for greater power output.
• 69mm Valve Length: Equipped with 69mm valves, allowing for improved airflow and combustion efficiency.
• 17mm Intake Port Diameter: Facilitates optimal fuel-air mixture intake for a more powerful combustion cycle.
• 18mm Exhaust Port Diameter: Ensures efficient expulsion of exhaust gases, contributing to better engine performance.
• 49.75mm Exhaust Bolt Hole Spacing: Designed for secure and proper fitment of the exhaust system.

Compared to standard 50cc GY6 engines, this 100cc big bore kit offers a substantial increase in power and torque without requiring a complete engine swap. It's engineered for riders seeking a noticeable upgrade in acceleration and top-end speed, making it ideal for those looking to get more out of their GY6 platform.

Engineered for Peak Performance

This kit leverages a larger 50mm bore for increased displacement, directly translating to more horsepower and torque. The integrated EGR cylinder head is designed to work harmoniously with the kit, optimizing combustion for a smoother, more powerful ride. Every component is manufactured to ensure durability and reliable performance, making this an excellent choice for dedicated enthusiasts.