A 250 seems awfully small for the long trip back but this bike does seem to have a lot going for it. I'm surprised they aren't offering a larger displacement version.
Aftermarket parts supports seems pretty good based on some google searches:
2013 Yamaha XT250 Specifications, specs
2013 Yamaha XT250 Specifications, The XT250 offers reliable performance, ease of use and all-around function for the ultimate in versatility.
http://www.yamaha-motor.com/sport/p...
I'm still intrigued by the BMW XChallenge and XCountry which I want to look at. If I were to get a BMW, especially through Bob's, I think there's a good chance they'd host one of their evening events about the trip which would get the site a bit of exposure. If I do it on some Japanese bike, then I suspect that possibility is off the table. I'm not sure how important that is but it is a thought in the back of my mind.