Centrifugal Mini Bike, Go Kart, Small Engine Clutch 10 Tooth Sprocket for use with 40, 41, and 420 Series Chains Fits 2-6.5hp Engines, and Go Karts with wheels 15″ or under 5/8″ bore and 10 tooth designed for 6.5hp 212CC engines??for 40, 41, or 420 series chain. This is a high quality, centrifugal clutch that is suitable for numerous mini bike and go kart applications Made of high quality iron material,which is lightweight, portable, sturdy, durable, maximum torque, wear-resisting and fast heat disation Centrifugal Mini Bike, Go Kart, Small Engine Clutch 10 Tooth Sprocket for use with 40, 41, and 420 Series Chains Fits 2-6.5hp Engines, and Go Karts with wheels 15″ or under This clutch has a 3/4″ bore and 10 tooth sprocket for 40, 41, or 420 series chain. This is a high quality, centrifugal clutch that is suitable for numerous mini bike and go kart applications