04 Yz 450 motor to fit a 01 wr400 frame

anyone know if they are interchangeable, or if there's a mod to be done?

cheers

It can be done but with some serious fab work and engineering..... Good luck!

It would require custom inserts at the swing arm pivot/rear hard point, custom front and top mounts, and the possible relocation of the lower engine mount on the frame. Considering the price of complete, running Gen 1 YZ450's, and how much lighter they are, it hardly seems worth the work.

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