## Magneto Inner Diameter 90mm 139QMB/QMA (GY6 50) 4T This high-quality magneto with an inner diameter of 90mm is the perfect replacement for the original part for scooters with a GY6 4T (139QMB/QMA) engine. Designed by BT, the type B magnetic wheel works with a stator with a 3-pin alternator plug. It ensures reliable operation and optimal engine performance. Please check before ordering that you have chosen the correct type. ### Why choose this magneto? * **Perfect fit:** The magneto is dedicated to scooters with GY6 4T (139QMB/QMA) engines, guaranteeing trouble-free installation and compatibility. * **High quality:** The BT product is a guarantee of solidity and durability, ensuring long-lasting and trouble-free operation. * **Optimal performance:** The precisely manufactured magneto contributes to stable engine operation and optimal current generation. * **Easy installation:** Replacing the old magneto with a new one is quick and easy. * **Safety:** A reliable magneto is the basis for safe and comfortable driving. ### Specification: * **Inner diameter:** 90mm * **Type:** B * **Compatibility:** GY6 4T engine (139QMB/QMA) * **Alternator plug:** 3 pins * **Brand:** BT