Hello I am a new member, but I currently own an 2005 400, and a 2006 650. I have 30K on both of them. The 400 has a horrible, very loud rattle only when sitting and idling, it is so loud that you can not carry on a conversation close to the bike. That noise goes away when you pull away from the stop, the noise comes from the right rear housing. It has been going on for about the last 3,000 to 5,000 miles. Any ideas???