Change of sprocket size

[MrFaulty]

Hi, I have a 2003 ZX6RR which has an inaccurrate speedo. I checked with Kawasaki and they said I should have a 43tooth rear sprocket but I have a 40 tooth - I haven't checked the front as it can't be seen without some work. If I put a 43 tooth sprocket onm, what differences will it make?

Thanks
Ben

[oldman]

According to my sources the front sprocket on your zx6rr is 15 teeth and the rear is 40 teeth from the factory. Of course I am getting information from a source in the U.S. but I doubt the Aussie version would be different. Adding 3 teeth to the rear would decrease your top speed and increase your rear wheel torque. A shot and a brew help all troubleshooting.