This 19 spline variator assembly for scooter & go-kart engines, specifically size 125cc GY6 QMI152/157 and 150cc GY6 QMJ152/157 comes complete with a full set of six 18 mm x 14 mm 13 gram roller weights The variator assembly is used on a wide variety of scooters and ATV brands and models that have Chinese built 125cc GY6 QMI152/157 and 150cc GY6 QMJ152/157 engines 30 Day Warranty Description This 19 spline variator assembly for scooter go-kart engines, specifically size 125cc GY6 QMI152/157 and 150cc GY6 QMJ152/157 comes complete with a full set of six 18 mm x 14 mm 13 gram roller weights. The variator assembly is used on a wide variety of scooters and ATV brands and models that have Chinese built 125cc GY6 QMI152/157 and 150cc GY6 QMJ152/157 engines. Please check the dimensions on the Specs tab to see if this is the correct variator assembly for your scooter. There are many brands of Chinese built 125cc GY6 QMI152/157 and 150cc GY6 QMJ152/157 engines, and interchangeabil