note the apparently... mind you, thats info directly from the 'wise guys' on itr-dc2...
snip
I don't know of anyone on there worth listening to that would tell you that you can do that.
Ask yourself why would you want to raise the rev limit in the first place? To move the powerband higher up, great, that's usually inclusive of using aftermarket cams. Anything with lift over and above standard will be getting mighty close to coil bind.