A jackshaft or motor sprocket is a very important part of your drive system. This #35 chain - 18 tooth jackshaft sprocket with a 5/8" bore for go-karts and mini bikes includes two set screws and a 3/16" keyway slot.

Specifications:
Diameter: 2-3/8"
Bore: 5/8"
Keyway slot: 3/16"
Depth: 25/32"
Tooth count: 18