For a 13 year old kid, with no racing expeirience, which dirt bike bike would you reccomend?

Monday, July 27th, 2009 at

i am 13, i have been on a motocross once. i want to start racing and i am 5'7, 115 pounds, and i want either a yamaha yz85, or yamaha yz125. or a honda cr85, or honda cr125.
which bike would you choose for me, and i want to get a later model like 2003. thanks alot.
i meant i have been on a motocross track once, but ive ridden for 2 years.