450 motor in a 400 chassis

would it be possible to put a yz 450f in a 98 wr 400f chassis. I have a 98 wr and its given me nothing but motor problems so i'm looking at putting a new motor in it. Any advice would be appreciated.

anything's possible - depends on how much customizing you want to do.

The 2003 frame is somewhat different from the 98-2002 frame - not so much in material and geometry, but there are some differences such as the top motor mounts, the 98 has 3 bolt holes, the 2003 has 2 - whether 2 of the 3 you have will line up - I don't know.

I'm sure it can be done with a little ingenuity and a welder....

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