I've had one engine egg out the small end of the rod. I noticed my Rossi 45 was getting some play at the prop tips after maybe 20 hours so I stripped it down. The small end (unbushed...in a Rossi??) was egged by .012" only on the bottom side of the bush. Obviously this also changed the timing and lowered the compression. Not being one to buy something if I think I can fix it I made a bush centred on the original rod length. I have no idea why it egged because the fuel was 80/20 all castor, never been lean it's life, always hand started and never thrashed with high revs.