Hi all, I wonder if anyone can suggest what is causing a rattling noise with my bike, a Yamaha YBR 125. When I let go of the throttle, a strange rattling noise comes from somewhere underneath me. If I coast with the clutch in and the bike in gear, the noise still happens. However, if I coast with the bike in neutral, no noise! When I change gear, the rattling starts as I pull the clutch in, stops for the split second when I'm changing gear, then starts again until I let the clutch out. I think it's getting worse and I assume it's the gearbox, but I know very little about the mechanics of a bike. Thanks