Most notable of mine was in a rebuild of a Manx Norton,the owner was very keen to run the bike in a track day,so I used a Bedford truck gudgeon pin bored thinner ,just to get the motor going for a "demo run ".......as might be imagined ,owners son ignored orders to just chuff around for a couple of laps,and floated the valves down the straight........gudgeon broke ,engine smashed to pieces ,even the mag was knocked off and ended up on the track.