I have a 2003 cr125 that I have done a ton of work on. I have just started racing hare scrambles and I am finding the 134 big bore to be difficult through rough terrain...no bottom end. I would really like to run a 250 2t and make it woods friendly (woods port,fly wheel weight, bottom end pipe etc) but if I sell me cr125(134) i will loose a ton of money. I could sell my motor and buy a cr250 motor and not be in terrible shape money wise. How difficult would the swap be? I assume the motor would not just bolt in.