Hello and Welcome!
I am sure others will chime in but here is my input
1) 4k miles on the tires means you will need a new set rather soon. (Will run you about $350 installed)
2) For a 2011 $7k is slightly high...especially if cosmetically it is not "Mint" condition, although the mileage is about right.
Its not a "bad" deal.....but I think you can do better...like say $6500 for his bike, or cough up an extra few $$$ and buy a brand new "left over" 2013/2014. I see you are in NJ and there should be plenty of new ones left on our side of the pond with all this snow at decent discounts.
Also...I understand he is throwing gear in to sweeten the deal.....if you don't have gear that could save you a couple of $$$ so in that case $7k would be an Okay deal.
p.s. if the bike was dropped the value "drops" too....so $7k should be out of the question at that point