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Trust OMB Warehouse for the best products in Mini bike 5/8 in jackshaft sprockets, whether purchased singly or as complete kits. Get OEM replacement parts for your mini bike that are sourced from leading brands and manufacturers. A jackshaft is often just a short stub with supporting bearings on the ends and two pulleys, gears, or cranks attached to it. In general, 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. Itincludes two set screws and a 3/16" keyway slot. One of our top-selling items is the #40/41 Chain - 12 Tooth Jackshaft Sprocket with a 5/8" Bore for Go-Karts & Mini Bikes. It has a 12 tooth jackshaft sprocket, 2-1/8" diameter with a 5/8" bore, and includes two set screws and a milled keyway slot. These Mini bike 5/8 in jackshaft sprockets are for#40/41 chain. OMB Warehouse also stocks the Complete Jackshaft Kit 5/8" X 10" for #35 chain. This is very popular for mini bikes and includes 5/8" by 10"Jackshaft With 3/16'' Key way.