BDL ongoing quality control ensures that every pulley and primary kit will be exact in every aspect as BDL's customers have come to expect Designed for kickstart models only BDL 3" 8MM Primary Belt Drive is for use with stock clutch, recommended upgrade to BDL Competitor clutch Splined Engine Shaft Quality 356T6 cast pulley CNC machined and hard anodized Big Fix bearing kit included Made in USA