Genuine Baja Motorsports Replacement Part Product Specs: Chinese complete variator assembly for the 2-stroke 50cc and 90cc engines used in several makes and models of scooters and atvs.There are two different variators used on the 2-stroke motors. One has a 21mm bushing and 15 teeth in the drive face. The other has an 18mm bushing and 17 teeth. This is the 21mm, 15 tooth version. Please check yours before ordering. Front variator plate OD: 95mm [3.73″] Front variator plate center hole ID: 21mm [.83″] Variator back plate teeth: 15 tooth Variator bushing OD: 21mm [.83″] Variator bushing length: 38mm [1.49″] Roller width: 11.7mm [.46″] Roller OD: 15mm [.59″] Roller ID: 8.6mm [.34″] Includes all pieces shown Compatible with SC50 50cc Baja Scooter Baja Part Number & Description: SC50-336; Drive Assembly