I pulled the engine out of my recently aquired '83 xl600 earlier. It had oil all over the top of the engine which i suspect is the valve cover gasket leaking. I removed the valve cover and discovered the center cam journal is galded/ground up. I am sort of confused at how it happened as it looks like all of the load should be on the outside bearings and that there shouldnt be much contact on the center journal? would this just be an oiling problem?