I have a 2006 R50 and I appear to have a small rattle sound coming from somewhere near the start of the headers or the pvc cover on top of the engine box. Its on the left hand side as you look towards the engine opposite side to the air box. When the car is off for a while (eg 12 hours or so) and I turn it on the rattle is there. Its like the sound a pebble would make if it was shook in a metal box I guess. It will make the noise, stop for 5 seconds, make the noise, stop for 5 seconds and keep on the cycle for a while, but it stops aftr i drive for a bit. Any ideas as to what the deuce it may be?