Wr450f Yz450f engine swap

Yo,

I have a 2009 Yz450f and a buddy of mine is giving me a 2007 Wr450f complete engine out of a part out that he did a while back. Is the engine a direct bolt on to my 2009 Yz? I understand that I will need to weld a battery box but I would really like to have the wr450 engine for Trail use and the electric start will be nice to have.

Some buddy you have, looking after u bro, motor will bolt up no probs, may have to check stator & electrical system if capable of cranking the E-start, cheers roosta

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