Hi All, I just bought a 2009 DRZ400. When I test drove it I didn't hear the sound, but when I got home I did. Here is what happens; only on deceleration I hear what sounds like marbles coming from the left side of the engine. This is the first DRZ I owned, so I'm not familiar with it as I am with my other bike. Anyone have an idea what this could be, or is this normal for this kind of bike? Thank you for your help!