some info that might help.....
you will love Mongolia! its great riding- great camping- not so great food.....
Simon and I road Mongolia in Aug last year - on our website we have a full diary + photos if you want to have a read2ridetheworld.com : diary
...and GPS ref too. which you can download. The file to download is at the bottom of the main index page.
a few recommendations - you may find June quite a bit wetter than say when we went in Aug. just be prepped for those rivers. the south 'route' is meant to be less wet - but it also has some terrible sections of corrugations interspersed with lumps of soft sand. take care and be aware! take a GPS. take a couple of good maps - one in English and one in Mongolian if possible as this gives you the opportunity to be able to point to a name that they may be able to read...
know how to repair a tire. take spare inners, a hand pump and elec pump to run off your bike. as you will be deflating for some sections.
take waterproofs! a tent, stove and cookware. you can not always rely on yurt-stays. camping is so much fun anyway in Mongolia.
fuel may also be a problem - we have very large capacity tanks and so didn't run out but....it can be very long distances between places where you can pick up fuel - and sometimes even when you get to one there may be no fuel. think of how you will carry extra if you have a standard tank size.
As you can see Simon and I had a wonderful time..despite it being quite a tough 'never let up' kinda ride..we would definitely go back.
if you get a chance to ride into the Gobi then do - its a long way down from UB to Dalanzadgad and then into the Gobi but well worth it- but its best not to do this on your own!
if you need more info etc...then you can always send me an email which is on the contact page of our website: 2ridetheworld.com : diary