Hi, Im 14 years old and i want to buy a dirt bike. Im about 5''4 and 120 pounds. Ive already tried a dirt bike but never owned one. I want a kawasaki Dirt Bike (4 stroke). Im not sure what size to pick. (I want a dirt bike that will last long enough for my size) Its either a KLX 125L or a KLX 140L. Which one should I buy? You can also tell me other suggestions.