Just to be clean, you can travel all teh way accross Mongolia on any many different bikes. I have seen plenty to GS 1200, I know a couple that crossed the whole Mongolia 2 up on a GSA with 40kg orf luggage without any problems, I've seen some F800GS performing perfectly, guys with Africa Twin, last year a German guy with a super overloaded Transalp...
I did it with a R100GS PD, 2up. So it depend on your skills, and on the preparation of the bike as well.
Most important! Suspension!!!!!!!!! Don't save bucks on a harder spring, you will regret it, especially when travelling 2 up.
The Tenere 660Z is not lighter than then F650GS. I dont see a big advantage here in favour of the Tenere. This bike has quite crappy suspension from stock.
I would do it again with my 640 Adventure, what a blast it would be, but solo only.
To travel 2 up, you need some comfort, otherwise your wife gonna hate you!
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