## Timing Chain Tensioner 139QMB/QMA (GY6 50) 4T This high-quality timing chain tensioner is designed for popular Chinese 4-stroke GY6 50cc scooters. It ensures optimal timing chain tension, resulting in smooth and reliable engine performance. Proper chain tension minimizes the risk of chain skipping, protecting the engine from serious damage. ### Technical Specifications: * Distance between mounting hole centers: 40 mm * Hole diameter: 6 mm ### Why choose this tensioner? * **Precise Manufacturing:** Guarantees a perfect fit and long-lasting performance. * **Compatibility:** Designed for 139QMB/QMA (GY6 50) 4T engines, ensuring easy installation and trouble-free operation. * **Reliability:** Robust construction provides stable timing chain tension under all conditions. * **Engine Protection:** Prevents chain skipping, protecting the engine from costly repairs. Investing in this tensioner is an investment in the longevity and smooth operation of your scooter.