I came back from a short ride today and after cleaning it up I was pulling it into the garage. After starting I held the clutch in, waiting so it wouldn't clunk as loud, and when I let it out I noticed it sounded like some marbles rolling around inside making a low level rattle. With the bike in neutral and the clutch held in there is no noise but when you let it out there is. Any ideas? It's a Ultra Limited with 400 miles.