## Camshaft Rocker Arm Bridge for Standard 64mm Valves 139QMB/QMA (GY6 50) 4T This camshaft rocker arm bridge is the perfect solution for GY6 4T engines in 50cc vehicles, such as popular scooters and quads. Compatible with 139QMB/QMA models, it ensures precise valve timing, resulting in smooth and efficient engine operation. The 64mm length corresponds to standard valves, guaranteeing hassle-free installation and correct operation. ### Why choose this camshaft rocker arm bridge? * **Precision:** High-quality construction ensures accurate valve control, which is crucial for optimal engine performance. * **Compatibility:** Designed specifically for 139QMB/QMA (GY6 50) 4T engines, it guarantees a perfect fit and easy installation. * **Durability:** Made of robust materials, the camshaft rocker arm bridge is resistant to wear and tear, ensuring long-lasting operation. * **Standard Length:** The 64mm length corresponds to standard valves, eliminating compatibility issues. ### Note regarding valve length: 139QMB engines had two valve lengths: short 64mm and long 69mm. Before purchasing, please ensure that the bridge you order matches the valve length in your vehicle. Choosing the right bridge guarantees the correct operation of the valve timing system.