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You will not get a better range of go kart Mongrel racing clutches than at OMB Warehouse. One of our top products is the clutch that fits ¾ in standard crankshaft with a built-in square key and set screws. This highly durable clutch is designed for the most rugged applications that could be required from an automatic centrifugal racing clutch. This is good for up to 16 hp 4-cycle engines with approximate engagement at 3200 rpm. The sprockets that we supply with the go kart Mongrel racing clutches are made by leading brands with several internal spacers that can be removed as needed to accommodate similar gears. Whatever sprockets that you have, add or remove shims to obtain the same amount of play that the drum and sprocket have on the hub when the clutch is new and out of the box. Go kart Mongrel racing clutches come with a spacer washer that is chambered on the inside of one side. The spacer goes on the crank first and the chamber goes towards the engine. The clutch can then be mounted either in-board or out-board using the supplied key that is attached with the bolt and the internal washer.