im 16 and 6'2.5" and 270 and im pretty good iv riding dirt bikes since i was 9 and quads since i was 7 and i want to get a bike im leaning towards a 4stroke yamaha but should i get a 450 or a 250 i know a 450 is to big to ride for a advanced begginer but ill be riding almost everyday and iv been riding a xr250r 10-12 hours a month and im progressing on that thing very fast went from scared of the big 250 to whellies powerslides jumps in a day