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OMB Warehouse stocks a large collection of mini bike 1 in clutches that are of the highest quality and used as OEM replacement parts for most mane and model of mini bikes. Our top selling product is the heavy duty clutch assembly with 1" bore & #40/41/420 chain sprocket for mini bikes. You get a choice of 10 tooth or 14 tooth sprockets. Other specifications include 1" bore diameter and 1/4" keyway slot, and fits many belt-drive mini bikes. The package also includes set screws. Another item that we stock in mini bike 1 in clutches is the centrifugal clutch 1" bore 14 teeth 40/41/420 chain mini bike engine up to 8hp, 2300 rpm. The Sprocket is 14 teeth and is for Chain: #40/41/420 which is not included in the package. It is built in 14 tooth, 1" bore, 40/41/420 chain with 3/16 key and made of high quality iron material, which is lightweight, portable, sturdy, durable, maximum torque, wear-resisting and fast heat dissipation. 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 mini bike. There are many other similar top items in our inventory.