Warp 9 Jack Shaft Sprocket

The front jack shaft sprocket, made from hardened tool steel and black oxide coated so it lasts longer than the sprocket it replaces. It is offered in two sizes, and one tooth at the front changes gearing more than one tooth at the rear does.

Fourteen tooth is the stock size and a straight replacement for a worn original. Fifteen tooth raises top speed and extends range by dropping motor rpm at a given speed, at the cost of low-end torque, which suits open riding more than tight, steep ground. Check the chain has enough adjustment left before changing sizes, and inspect the rear sprocket at the same time.