100cc QMB139 50mm Big Bore Cylinder Kit for GY6 Engines

Upgrade your GY6 scooter or ATV with this comprehensive 100cc Big Bore Cylinder Kit, designed to significantly boost engine performance. This kit replaces your stock 50mm cylinder and head with larger components, delivering a substantial increase in displacement and power output for a more thrilling ride.

• 50mm Piston Diameter ensures precise fitment and optimal compression for enhanced power generation.
• 64mm Cylinder Head Valve Length contributes to improved airflow and combustion efficiency.
• 59.5mm Cylinder Head Overall Height offers a robust build designed for performance applications.
• 17mm Intake Port Diameter facilitates increased air/fuel mixture intake for greater power.
• 18mm Exhaust Port Diameter allows for quicker expulsion of exhaust gases, improving engine breathing.

Compared to standard 50cc GY6 engines, this 100cc big bore kit represents a significant leap in performance. While stock engines often struggle with acceleration and top-end speed, this upgrade provides the torque and power needed for quicker take-offs and sustained higher speeds, transforming your riding experience without requiring complex engine modifications.

Unleash Peak Performance: Advanced Engine Technology

This kit features a non-EGR (Exhaust Gas Recirculation) style cylinder head, promoting cleaner combustion and allowing for optimal tuning. The precisely machined 50mm bore cylinder, paired with the 50mm piston, maximizes the engine's cubic capacity to 100cc. Components like the included piston kit, head gasket, and base gaskets ensure a complete and reliable installation, providing a durable foundation for a high-performance GY6 engine.