My 2008, with 700 miles, has had a very rough idle since I purchased it a few weeks ago. Needed to stay on the throttle or she would die at idle. I thought the problem was bad gas, but after a few tanks with Sea Foam, the problem was as bad as ever. It eventually got very tough to start, with backfiring and flooded-like symptoms.
I read about a fresh spark plug clearing up similar issues for others, and sure enough, putting in a new plug has my idle rock solid. Went for a long ride tonight and didn't have any issues. MUCH more fun to ride this way...