2007 is the last yr of the 2 strokes.i was riding a yz 80 at 12 yrs old and by the time i was 15 maybe 16 i was riding a 250 with no problem..its not the bikes fault,its the rider.125 and a 250...theres a difference but not a whole lot,yes its faster,but it still hauls ass 80 125 250 they all get up and go