It seems geared so that it runs out of puff at the redline. A number set by Honda to stop you blowing the engine up.

Why the desperate urge to get it over 12000? If that's all you want, then lower the gearing and it'll rev until it goes pop.
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball