im on a 07 yz 250f right now and i ride mostly fields so i want alot of power, i bought a 250f thinking it would be fast enough and i learned alot on it for the time i had it, but i always seem to look for another gear on it, so i wanted to jump to a 450, i started on a pw 80, went to a ttr 125, then to a 250f so i think im ready, i wanted to hear your guys thoughts first, thanks for the help guys