Ok i have been hearinf that they sell a big bore kit for the 250x? like all the way to a 410cc bike? and i am wanting that so can anyone please help me out?? i already have a 80mm big bore kit on the stock cylinder but if i can get the bigger kit that would be great! i am putting a 12mm stroker crank in the bike also so im not to worried about the bottom end but if someone could help me out that would be great Thanks!