Ah, why?
Probably for the opposite reason that, at some point, I want to lower mine, ie he's very tall and it's too small for him!
@Yogi - A couple of problems that immediately come to mind:
1) You'll be changing the steering geometry, but you're going to need to raise the yokes which might be a bit tricky unless you get a longer set of forks. If you don't, you'll find it turns in more sharply than you're used to.
2) You may also need to lengthen the side stand, otherwise it will lean over further on it than previously, potentially making it more likely to fall over if it's on a slope.
Hope you get it sorted.