## 90cc Complete Cylinder Head - Boost Your 139QMB/QMA (GY6 50) 4T Scooter's Power This 90cc complete cylinder head is the perfect solution for 139QMB/QMA (GY6 50) 4T scooter owners looking to enhance their vehicle's power. Designed for 50mm diameter cylinders, this head features enlarged valves for improved fuel-air mixture flow, resulting in a noticeable power increase and better performance. ### Benefits of using the 90cc cylinder head: * **Increased power:** Enlarged valves provide better cylinder filling, leading to higher engine power. * **Improved performance:** You'll feel the difference in acceleration and top speed. * **Easy installation:** The cylinder head is compatible with GY6 50 engines and easy to install. * **No EGR:** The absence of an EGR system means no exhaust flow restrictions, further contributing to improved performance and simplified design. ### Technical specifications: * **Capacity:** 90cc * **Piston diameter:** 50.00mm * **No EGR:** Yes This cylinder head is an excellent choice for those who want a simple and effective way to boost their scooter's power. It provides not only better performance but also increases riding enjoyment.