Well I'm now suffering bad vibes after a session checking the valve clearances.Again I'm convinced this is down to a nut not torqued to its sweet spot as josephau puts it.As the tank and engine bars were removed I suspect it is one of their fixings to blame.

I've had this before with handlebar vibes and it was down to a combination of handlebar/bar brace position and tightness of the nuts in the end.Bloody annoying because it is really intrusive at 3500 to 5000 revs.

I've just torqued the front engine bar nut to the correct value hoping this is to blame, will test it when the monsoon subsides.

Incidentally my engine bars are still crack free after numerous drops offroad and using them as jacking points.The paint finish is abysmal though.