I recently rebuilt a crash damaged Saito 72 with reportedly less than 5 hours running time total. Both cam followers had the outer edges worn on opposing sides giving the appearance of a slightly peaked roof, with the worn areas having a scuffed appearance. The cam lobes showed no appreciable wear. This is obviously a lubrication failure problem. I suspect that the engine had never been treated to an after run oil. This engine has the breather nipple at the bottom of the front case which should ensure proper lubrication to the cam box area. The cam followers in this engine are significantly smaller diameter than those used in OS engines and are therefore more highly loaded.

I have never seen this type of wear before in rebuilding many 4 stroke engines.