Transmission Cover Assembly - Short Case - for QMB139 50cc Engines (1121_SC) Short Case. Kickstart Gear is Included. Transmission CVT Cover for 50cc, 4-stroke QMB139 engines. Fully assembled ready to install. This is the Shortcase version commonly found on QMB139 scooters with 10" Rear Wheels. Overall Length: 15.75 inches