743-20-30 Premium scooter CVT belt Typically works on most 125cc-150cc 4-stroke GY6 scooter engines Description 743-20-30 Premium scooter CVT belt. Typically works on most 125cc-150cc 4-stroke GY6 scooter engines. Also works on many ATVs, dirt bikes and go-karts. This belt is used on the Monster Scooter Parts 150cc replacement scooter engine: 150cc 4-Stroke GY6/QMB139 Scooter Engine w/ Automatic CVT Specifications Length: 743 mm/29.25″ Width: 20 mm/0.78″ Angle: 30 degrees