Drive belt for Chinese scooters with 10", 12" or 13" wheels
You first need to determine if your scooter has a short case or a long case. Short case is the most common. If you have 10 inch wheels, you have a short case. If you have 12-13 inch wheels your scooter has a long case. Look on the engine case and be sure your engine is a QMB139. This is the most common Chinese scooter engine. It is a 4 stroke 49cc/50cc. The engine code is located on the left side. It is stamped right next to the center kickstand pivot point.