motor probally fits but the ecu for sure wont work. ive thought about just putting an 07 head on my 06 but no one can get me the stock ignition curves of the bikes so i can see how much I have to adjust it
But there are loads of other bits you will need like the ecu, loom etc.
Search a thread by "Dark" he had a very trick 04 with an 07 motor in it. He did a great wright up of the process :boobies
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