13 Teeth drive gear Fits a 428 chain HD 428chain clutch and sprocket set for import Gokart and Buggy engines with parallel 19mm engine drive shafts. Replacement clutch for many chinese manufactubrands and models. Please check out the size carefully and compare to your original one before ordering. Material: Steel13 Tooth sprocket.Fits a 428 chain.19mm metric bore.HD 428chain clutch and sprocket set for import go kart and buggy engines with parallel 19mm engine drive shafts.Fits the wide range of import clone engines used in go karts and Buggies normally on 3.5-7HP 170F engine styles.Package Included: 1 x Centrifugal Clutch