My nephew just purchased a stock 04 YZ 450 that has minimal trail hours on it from a friend. He says that the clutch has a rattling noise when running in neutral and the noise goes away when the clutch lever is puled in. The clutch feels normal and does not slip and works well otherwise. Is this normal on the 450? He has been riding an 00 426 for several years and never had noises like this from the 426. Anyone else have this on their 450?