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older engine in newer frame

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Does anyone know if the older 93-98 YZ/WR engines would fit in a 99 rolling chassis?Would the airbox line up close as well to carb of the older engine.Thanks.

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anything wll fit if you have a big hammer..

I am sure the airbox boot would be close. The motor mounts may need to be moved however.

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What I'm wondering is if the bottom end mounts of the motors have the same dimensions relative to the frame.

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I have a site i reference that says the cases 88-95 fit each other, 97-98 fit each other, and 99-01 fit each other. Doesnt look like they will swap. But like your original comment, not sure if just because the cases are different it necessarily means the mount patterns are different.

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If you can rebuild the 99 motor. Its basicly the same as the newer YZ's.

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I realize that, but that's not what I'm asking.

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