[Lynn_Keen]

Do the Rotors need changing or the spacers - the noise is dreadful, bike still stops on a pin though!

Unfortunately the rear rotor is not re-buildable. It is a floating rotor and therefore there is a small movement allowed even when the machine is new. Unfortunately the rivets that hold the assy together wear and eventually the rotor starts to rattle. Your choices are, replace with a new one - probably around $300, do a search in the Hall of Wisdom for possible temporary repairs, get some ear plugs! Fortunately, while annoying, it's not a major safety issue. Good luck.