If that is truly the case, why the comparison using different gears? A better comparison would be 12k in 6th pre-sprockets and 12k in 6th post-sprockets. And some bikes max out in 5th by the way (ZX-14).
A forum community dedicated to all Kawasaki motorcycles including the ZX-6R, KLR 650, Ninja 250, Ninja 250R, and Vulcan. Come join the discussion about performance, modifications, troubleshooting, maintenance, and more!