Originally dribbled by NinjaFrog I have heard on a number of occasions that the stuff written in the manual is not the best way to run in a bikeIt errs on the side of caution perhaps, and the sudden jump in allowable revs after the first service or (10,000 miles if you're on a ZX12R

) is silly, yes. The thing to do is stick within 1000rpm of the recommended rev limit for the first half of the running in schedule, and build up gradually (+1krpm/100 miles or so) for the second half of the schedule.
Lots of rev and gear changes, don't labour the engine in too high a gear, and change your oil yourself half way to your first service.
Ideally, fit a couple of magnets, or magnetic sump plug, to the underside of the engine for magnetic oil conditioning, keeping the swarf out of circulation.
A real-world problem is that the 5-6krpm for the first few hundred miles is going to leave you as cage fodder, with arseholes swarming all over you at 70mph on many roads. Nice empty twisty roads with the occasional straights are perfect, but try finding them here inside the M25...
I am more concerned about keeping the engine in tip top condition as long as possible. Don't wheelie it then. Oops, you bought a B12 didn't you?