2003 Ec 200 into 2006 Ec 125 frame

[GSP]

Hi, was wondering if anybody could give me a little info. I have come accross a good cond Ec 200 motor 2003 model, and wanted to know firstly if the 200 range has changed significantly over the years in turms of motor spec. It seems that the motor has stayed neerly identical over the years ? and secondly if the motor would bolt right up into my existing bike. I currently love my bike and would not want to change, but we do a lot of very technical mountain rock riding and the 125 takes a little strain and I could do with some more bottom end. Any info would be greatly appreciated. regards Gary