My 2009 K1300 GT has had the so-called "box of rocks" noise at start up for a while including a start up at the Chief Joseph Rally that literally turned heads in the parking area. The noise does not happen every time my bike has been idle for a period of time, but when it does it usually lasts a few seconds until the pressure builds up and then is not noticeable. A few days ago I noticed the same start up noise, but after that subsided there was a residual noise sounding like a sticky lifter on an automobile or like a chain slapping against another surface. The noise accelerated with more throttle, but remained. BTW I installed the cam chain jump guard some months ago. I haven't started my bike up yet, but have made an appointment at a local BMW dealer to look it over. I'm thinking a failed tensioner or a stretched chain? I'd appreciate any thoughts you all might have. Thanks in advance.