im about 5'6 and i ride a crf 250r, if you are 5'4 then a 250cc 2 stroke is way to big, if you just starting out i would go with an 85cc bike, but in my opinion i wouldnt get a kawasaki...there 85s are that great and the 100cc's arent anything to brag about, i would go with a honda or yamaha, i used to have a cr 85 expert and i loved it