Hey Guys, My son just turned 14 and he has grown like a weed. He is now too small with his XR100 and he wants a YZ250F. He is 5'9", 125 lbs. I am concerned that the YZ maybe too big and fast for him. He is a great rider on his XR100. I have seen him climb hills with that bike that I would not have dreamed it could make. On one nasty hill, I saw a DRZ400 rider turn around and we went flying by. He talked about it for a few days. I tried to have him look at the WR250F, but, he wants no part of it. He worships the motocross guys. Anyway, at least the YZ250F is lighter. I noticed that it does not have the radiator overflow bottle like my WR. Does that cause the YZ to overheat more on the trails. I am also concerned that the first gear of the YZ250F maybe too high. Thanks in advance on any advice you could give me. As you may know, even if there is a better bike for him, he is that age where he will not even consider it. He wants to ride what his heros ride.