100cc QMB139 Big Bore Cylinder Kit for GY6 Engines

Enhance your GY6 scooter's performance with this comprehensive 100cc QMB139 Big Bore Cylinder Kit. Specifically designed for GY6 engines, this kit includes a cylinder, piston kit, cylinder head, and all necessary gaskets to upgrade your engine's displacement.

• 50mm Piston Diameter ensures a precise fit for increased engine volume.
• 50mm Cylinder Bore provides the foundational measurement for the enhanced engine capacity.
• 64mm Valve Length indicates optimized airflow for improved combustion.
• 59.5mm Cylinder Overall Height guarantees compatibility with standard GY6 engine configurations.
• 17mm Intake Port Diameter allows for robust fuel-air mixture entry.
• 18mm Exhaust Port Diameter facilitates efficient expulsion of burnt gases.
• 49.75mm Exhaust Bolt Hole Spacing ensures secure mounting of the exhaust system.
• 44.75mm Intake Bolt Hole Spacing provides reliable attachment for the intake manifold.

Compared to standard 50cc engines, this big bore kit dramatically increases cubic centimeters, leading to significant gains in power and torque. The included EGR-style cylinder head is engineered for optimal performance and compatibility, making this kit a direct upgrade path for riders seeking more from their GY6.

Key Technical Advantages: Technology and Performance

This kit leverages a larger 50mm piston diameter to achieve a 100cc displacement, directly translating to a substantial boost in horsepower and acceleration. The precisely machined components, including the cylinder head with its specific valve and port dimensions, are designed to work in harmony, maximizing efficiency and power delivery for your GY6 QMB139 engine.