This clutch is used primarily on Go Kart and Mini Bike, Lawnmower and Fun Kart, also it can be used for many other applications Tooth:10T; Work with #40/41/420 Chain (Chain Not included) 5/8″ bore Designed for 6.5hp 212CC Engines Package included:1 x Go Kart Centrifugal Clutch Made of high quality iron material,which is lightweight, portable, sturdy, durable, maximum torque, wear-resisting and fast heat disation If the centrifugal clutch is broken or malfunctioned, you should change it with a new one without any delays. Otherwise, it would endanger your child, your friends or families.Under this circumstance, you should buy a centrifugal clutch and this Go Kart Centrifugal Clutch would be a great choice. Specification: Two set screws are included, but chain is Not included. 5/8″ bore10 TeethFor # 40/41/420 Chain This clutch is used primarily on Go Kart and Min