Thanks Guys ,
I agree , something is out of balance. I do warm to the idea of a clutch plate , though the clutch works faultlessly , makes the usual grumble out idle with the clutch out though.
I had adjusted or replaced the following :
Balance shafts - adjusted 3 times, ( once by Honda , twice by me )
Valve clearance - twice
Starter valves - twice ( once by Honda , once by me )
Oil grades , including Honda GN4 , Motul 15w 40, Shell Advance Synth 15w 50
All wheel and hub bearings replaced
2 new tyre sets ( Dunlop and Bridgestone )
Open to any other ideas, I really love the bike and it works for me.
The vibration seems worse above 2800rpm when accelerating in 3rd and 4th , but this maybe just the variation in gearing
Thanks for any help