Chain was off my Transalp that was written off, had less than 2K miles on it but not sure which way round it was so could be reversed - hadn't thought of that. Front sprocket must have been non Yamaha as no rubber ring/damper on it. I may refit the 520 C&S and see if the whine disappears. I don't like it - sounds like a bearing on the way out, but they all seem smooth and free of play.