A chainsaw sprocket is the small wheel at the end of the chainsaw bar that engages with the chain. The teeth on the sprocket help to drive the chain around the bar, which in turn cuts through whatever materialyou're working on. Over time, these teeth can become worn down and will need to be replaced in order to keep your chainsaw running properly. The more teeth a sprocket has, the slower the chain will move. lf your chainsaw isn't working properly, onepotential issue could be with the sprocket. lf there is something wrong with the way it's been installed or if it'sdamaged, then it can cause problems with cutting.