Not everyone who rides the Ninja 1000 finds it bafflingly undergeared, but I do. And there is substantial forum chatter concerning sprocket swaps. Kawasaki supplies the bike with a 15-tooth countershaft sprocket and a 41-tooth wheel sprocket. Readily available parts allow going up one tooth in front and down as many as four in back. To test gearing, I moved through a sequence, first installing the 16-tooth countershaft sprocket, then fitting a 39-tooth rear, followed by trying a 37-tooth rear sprocket.