Hi Keith and welcome to the elite part of the DSC!If you are due a belt change,i would suggest you do it NOW!!The consequences of one snapping is horrendous.The 888 do vibrate a fair bit when given there head and if there is an underlying problem there tends to be more than tinkling(ie knocking or excessive vibration).They are not known fro bearing failure.Clutch and alternator nuts is about it(oh and recifiers!").Enjoy-but get those belts done!!