... of GY6 50cc(139qmb) engine parts such as spark plug. You can get more information after contact ... of GY6 50cc(139qmb) engine parts such as spark plug. You can get more information after contact ... parts.2. We can also supply engine related electric part for motorcycles such as CDI, magneto, rectifier ... , flasher, relay, electric coil, battery and others. Please contact us if ...