aaahhh, the good old days eh, amazing how we so fondly remember the (actually!) bad old days lol, however, the biggest remembering of my BSA 1961 A7 days was thinking (a) will it start? ...after it had been parked in the rain while I was in college and (b) will I reach home tonight...in the rain? Countless times I had to leave the bike somewhere "safe" because it would stop when it rained, then later go back and pick it up, when it would start and drive perfectly gggrrr!
Something to do with the magneto and I tried EVERYTHING to seal it, to no avail, used to wrap a plastic bag around it if I thought it was going to rain that day, didn't help!!