Our AlveyTech #35 chain - 12 tooth jackshaft sprocket with a 5/8" bore for go-karts and mini bikes includes two set screws and a 3/16" keyway slot. The jackshaft sprocket transfers the power from the engine to the rear axle by way of the chain. It is a very important part of your drive system. Specifications Diameter: 2-1/8" Bore: 5/8" Keyway slot: 3/16" Depth: 25/32" Tooth count: 12
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