100cc QMB139 50mm big bore cylinder kit for GY6 engine with 69mm non-EGR head, part of ChinesePartsUSA engine components collection.
100cc QMB139 GY6 engine big bore cylinder kit with 50mm bore and 69mm Non-EGR head, used for engine upgrades.
100cc QMB139 Big Bore Cylinder Kit for GY6 engine with 69mm Non-EGR head, includes cylinder and engine parts from ChinesePartsUSA
100cc QMB139 GY6 engine big bore cylinder kit with 69mm non-EGR head, featuring engine parts from ChinesePartsUSA.
100cc QMB139 GY6 engine big bore cylinder kit with 50mm bore and 69mm non-EGR head, ChinesePartsUSA engine parts image

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

$97.25
By ChinesePartsUSA

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

Transform your GY6 engine with this 100cc Big Bore Cylinder Kit, designed to increase displacement and power. Featuring a precise 50mm bore cylinder and a performance-oriented 69mm non-EGR cylinder head, this kit provides a significant upgrade for your scooter or ATV.

  • 50mm Piston Diameter: Ensures the increased bore size for greater engine capacity.
  • 69mm Cylinder Head: Optimized for the larger bore, facilitating efficient combustion.
  • Non-EGR Design: Streamlines the system for potentially improved performance and simpler maintenance.
  • 59.5mm Overall Height: Critical dimension for proper engine assembly and fitment.
  • 17mm Intake Port Diameter: Allows for improved air-fuel mixture flow into the cylinder.

Compared to standard 50cc GY6 engines, this 100cc big bore kit offers a substantial increase in horsepower and torque, delivering more responsive acceleration and higher top speeds. By expanding the cylinder's bore from the original 39mm to 50mm, the kit effectively boosts engine displacement, providing a noticeable performance edge without a complete engine swap.

Key Technical Advantages: Technology and Performance

This kit focuses on expanding your GY6 engine's potential through carefully matched components. The 50mm cylinder bore, combined with the 69mm non-EGR cylinder head, creates a robust foundation for increased power output. Enhanced intake (17mm) and exhaust (18mm) port diameters, along with the specific exhaust bolt hole spacing of 49.75mm, ensure optimized airflow and efficient gas exchange for superior performance gains.

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