I bought a '96 ZX-6R last year, and since, it's been losing teeth like crazt on my rear sprocket. The chain is labeled a 525, and the rear sprocket is a 520 with 43T. I believe the front sprocket is the original one and should have 15 teeth. From what I've found, I think I need a 525 40T rear sprocket. Can anyone confirm that for me, or let me know how to figure out what sprocket I need?