The beast has been a gently vibrating delight but in the last few thousand miles the vibes have become steadily worse to the point where what was a pleasure is now a pain.
The bike has done about 16,000 miles total and has had no issues. This problem started about 3,000 miles ago.It has always been professionally serviced by the book.
It used to run happily up to 70mph with a particularly sweet spot between 50 - 60. Now its rough all the way through the rev range and buzzes like a mad thing on the over run at anything over 50mph.
The bike has generally got smoother and sweeter with the miles so this turn around has me and the dealer, an experienced RE man, mystified.
I couldn't find any probs with frame/mounts, nor could the servicing dealer who twice checked over the bike. They also popped off the side covers and confirmed no run-out on the crank, nice tight clutch unit and so on. There's never been anything nasty appearing in the oil.
Sorry for the long winded post. If anyone has had a similar experience or can suggest a course of action I'd be very pleased to hear about it.