Ghosts in the machine. Had a similar sit-rep at a deceased
friends house this weekend. Went to help the Widow with a freaky gas log insert problem. I got it working , went out to start the bike, LOUD click. Nothing, call for a ride and my tools, try again. Bingo, rode all day with no problems.
Some of this stuff ya just can't explain. And I am capable of just letting it be........