When sat at say 30mph and the road is a little bumpy the chain slaps against the under side of the swing arm making a really loud noise.
It is fine when accelerating hard and i have adjusted the chain.
Has an one else had this ?

First time it happened to me on a particularly bumpy stretch I could feel it thro the footrests, had to stop and give it a quick visual to make sure nothing was amiss.

Yep, i am experiencing those syptoms too ................. along with 1 or 2 other gremlins which have put my bike out of action . Its suprised me how noisy it is tho .