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If you are looking for mini bike ¾ in jackshaft sprockets check out the stocks at OMB Warehouse. We source these items from top brands for OEM replacement parts. A jackshaft is any shaft that is used as an intermediary transmitting power from a driving shaft to a driven shaft. The jackshaft sprocket transfers the power from the engine to the rear axle by way of the chain and is a very important part of the drive system. Our top selling mini bike ¾ in jackshaft sprockets has a #35 Sprocket with 3/4" Bore (B Type)11-Tooth with the following product specifications - Sprocket Type: B Type (hub on 1 side), Sprocket for #35 chain, 3/4" ID, 3/16" key broached into the hub rather than a keyway, so no key is needed. The package comes with Dual Set Screws. If your mini bike uses the popular #40/41 chain size, our 10-tooth jackshaft sprocket with a 3/4" bore for mini bikes is a high-quality item that will keep your machine at peak performance levels. It has a 10 tooth jackshaft sprocket for #40/41 chain, 3/4" bore with a 3/16" milled keyway slot. This jackshaft sprocket includes a pair of set screws and a 3/16" keyway slot to hold it tight to the shaft.