It can happen to any of them. Likely the bolts were left loose from the factory. The problem wasn't discovered until they had worked and wallowed the holes, the flatness of the sheetmatal, and the flatness of the engine bosses. At this point not a really practical way fix it other than pull the engine, weld pads on the frame, machine the bosses on the engine flat again.
First though I would try cleaning the holes with carb spray, get some grade 8 bolts or 10.9 if metric, some grade 8 flat washers. If you can, grind off any burs or protruding areas to let the engine sit as flat as possible.
Then red loctite everything, tighten as tight as you dare without stripping or splitting the bosses.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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