The crankcase cover for GY6 139QMB scooter mopeds, designed for 50cc scooters, is a critical component for ensuring smooth and efficient power transmission. This 400mm cover protects the transmission's sensitive parts, such as the crankshaft and camshaft. Its durable construction, made from high-quality materials, ensures durability and resistance to wear and tear. The cover features precise slots and keys, allowing for a secure and hassle-free assembly process, ensuring the transmission's longevity. With this cover installed, riders can enjoy worry-free rides, knowing that their scooters' power systems are protected and operating optimally.