If your machine uses the popular #40/41 chain size, our 10-tooth jackshaft sprocket with a 3/4" bore for go-karts and mini bikes is a high-quality item to keep you may want to try. This jackshaft sprocket includes a pair of set screws and a 3/16" keyway slot to hold it tight to the shaft. A jackshaft is a very important part of your go-kart, dune buggy, or mini bike's drive system.

Specifications
Diameter: 1-3/4"
Bore: 3/4"
Keyway slot: 3/16"
Depth: 7/8"
Tooth count: 10