OK - I bit on this ...... and there IS a bit of lifter racket going on there - but nothing that a UCE won't do. The fact that it IS quiet when you bring it off idle says to me that it ain't broke. If you revved it up and it got LOUDER, I'd then be concerned. Some causes - oil with too much viscosity, cold engine, or air entrained in the oil from being overfilled. ALL of these will make the lifters clatter a bit. If you are concerned, take it to your dealer - it HAS one of the best warranties on the Planet ..... Personally, I'd run it .... or, in the words of that ever-famous Ernest Angely:
"Place the afflicted part of your motor-sicle against the television screen, send a $75 dollar donation to ME and I'll pray, Pray, PRAY for the healing of the bike in the name of Cheezits and the Lard ..... "
Yeah - I paraphrased that just a little bit ......