400ex hybrid question

[derocha11]

iam wondering what kind of work needs to be done to fit a 450r motor in 2002 400ex frame and how hard is it and is there any motor that has about the same mounts as a xr650l thats what kind of motor my has in it right now but i would like to put a liquid in it instead

[rob-u/21]

You will have to build all new engine mounts, radiator mounts. It will probably be a lot of work. As for XR650L go, I would probably say the XR650r would be the closest you might get.