spooph: I tried your screw driver method for tracking down the other rhythmic clicking... Would you think I'm crazy if I told you I thought I was hearing it from the carbs!? I thought it originally sounded like it was coming from the rear, like around the carbs, but dismissed it and thought the sound was just bouncing off the top of the tank... but with the screwdriver it really does sound like it is at the carbs.... I'm not saying it is for sure, but it sure sounded like it.
Oh, and I think I discovered what that sound was on that second L turn on the way to work that had me so worried......
So mad at myself for not double checking that second nut! Let this be a lesson to all of us.... this likely happened within one mile from my house. Loose things come off FAST (and they aren't even Harleys).