A few years ago I rebuilt some carbs for a buddy.
complete rebuild, boiled, new jets, floats everything, the idle jets they sent were the wrong style for the carbs so since it was a rush job I decided to clean and re-use the old idle jets.
reassembled, boxed them up and dropped them off in the morning on the way to work, that evening while working on another bike, I found the baby food jar with the idle jets still soaking.
needless to say, the bike didn't run that well.
Ken