I've picked up another 08 rmz 250. The first one was for my son thats riding a 250cc expert (MX/trails combo) and a 13 to 29 yr "A" class. He is standing third in one and forth in the other. now, I really like his (stock w/ T4 exhaust) rmz so I got me one (used 08). Now I'm thinking about a 290 kit mostly because I'm standing about 250lb. Need a little more bottom end so that I can change the gearing to get more speed.... I ride mostly trails w/ a little mx ("C" class) thrown in... How would the 290 kit do??? What kinds of changes would the jetting need???? Would it need cams w/ the 290 kit to really pull me around????