well with my 0.40 over bore boysen power reeds 12/40 gearing and fmf power core 2 sinlcer im just a little bit behid a crf 150 top speed wise but i get one with botom end power but i have yet to race a crf 230 they have a little more bomtom end then the 150 from what ive seen and they got that extra gear i think ul be pretty happy with it id be very happy with one and i dont like 4 strokes but i dont realy ride dirt bikes but there pretty good when u get it let me kno how u like it