i'm 5'4" and also lowered the zx636 1-1/2". i coulda rode it stock, but i wanted to have a better footing. the self-confidence boost i get having it lowered more than outweighs any possible negative side effects you get from lowering. honestly, i didn't really notice any handling difference since doing it.
my 1st bike was the ninja 250. had 2 of those before tackling the 636. do yourself a favor and start on the 250. it'll do everything you need it to do. then move up when you are comfortable with riding. you'll be glad you did it that way in the end.
Last edited by itgirl25; 08-04-2007 at 04:41 PM.