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Check out the wide range of mini bike jackshaft sprockets at OMB Warehouse. All our stocks are of the highest quality and sourced from leading manufacturers. These items are perfect as OEM replacement parts and fit most makes and models of mini bikes. Our stocks are upgraded too with the latest specifications, designs, and materials when the mini bike manufacturers upgrade their models. One of our top-selling products in mini bike jackshaft sprockets is the #40/41 Chain - 12 Tooth Jackshaft Sprocket with a 5/8" Bore for Go-Karts & Mini Bikes. It comes with a 12 tooth jackshaft sprocket, 2-1/8" diameter with a 5/8" bore, and includes two set screws and a milled 3/16 in keyway slot. The jackshaft sprocket transfers the power from the engine to the rear axle by way of the chain. Similarly, for other chain specifications of mini bike owners, we also stock the mini bike jackshaft sprockets with a 5/8 in bore but fitting a #35 chain size. Then there is the #40/41/420 17 tooth 5/8 bore jackshaft sprocket gear for mini bike. This 17 tooth jackshaft sprocket has an ID of 5/8'' and set screws are included. Will work on #40 41 and 420 chains.