Centrifugal Clutch 1″ Bore 14 Tooth Perfect for 40-41-420 Roller Chain (Chain Not included) with 3/16 built-in key Screws Set and Allen Wrench are All Included. Using Screws Set to Secure Your Clutch to the Engine. 14 tooth clutch is used primarily on Go Kart and Mini Bike, Lawnmower and Fun Kart, also it can be used for many other applications Works with gas engines larger than 6.5 HP (top limit – 13HP) OEM Replacement Quality: Made of Quality Iron Material, Which is Lightweight, Portable, Sturdy, Durable, Maximum Torque, Wear-resisting and Fast Heat Disation Centrifugal Clutch 1″ Bore 14Teeth Perfect for Go Kart Mini Bike. (Chain Size: #40/41/420) This clutch is used primarily on Mini Bikes and Go Karts,Just the thing for a big go-kart or mini bike! Our centrifugal clutch assembly with 1″ shaft and 14 tooth 40/41/420 chain sprocket just may be the perfect missing item for your serious garage project go-kart. The 1″ bore allows this clutch to work with gas engines l