Re: 2013 Ninja 650 ABS - What a Disappointment!
although I know it is a different bike & different issue, when I first got my 2014 Honda CBR650F I noticed a lot of buzziness/vibration on the bike between about 6,000rpm-6,800rpm. After riding it over 1000km 90% of it went away as the engine and bike broke in. Not saying your problem is the same, but maybe it will get better as the bike smooths out over time (and makes things rattle less).