Hi. I am new to the world of dirt bikes and need some help, I am currently riding a crf150f and it is way to slow. I cant even go riding with my friends. I am leaning towards a ktm 125 or 150 2 stroke or a 250 4 stroke don't care what make. i ride mostly on trails, dirt roads and sand pits i want to be able to keep up with my friend that have kx250f's. I am 14, 5'7'' and 160lbs.