The only way to really know would be to compare measurements of the mount points on the XR motor with those of the one you would like to use. I would suspect that the rear case mounts to the frame would be no issue, and the cylinder head mount would be easy to fab if needed as it would be a couple of flat plates. The only real unknown would be the front two mount points, and again, the upper mount point to the frame is a pair of plates, easy to fab. The lower front would be the only potential spot where some welding may or may not be needed.
EDIT, nevermind Franque coming in with the good answers lol.
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