Good day I am new to the site and this is my first time at anything like this so please be easy on me. Ok long story short I have a 2002 Honda 450r that's all in parts frame and engine not together. I also have 2008 Honda crf250r complete running engine but no frame. I would like to know if the 250 engine would fit right on to the 450 with out to much modifications? Thanks in advance.