Buying a bike in another country for RTW

[StaleFish]

Here's a scenario and question for someone who has actual experience in this:

I'm planning to leave in July 2015 on my RTW trip. I am a US citizen, living in Texas, so I'll be headed into Mexico first. I'm thinking about buying a new Yamaha XTZ660 Tenere in Mexico, which isn't sold in the US, to do my trip. I'm not planning to "import" it into the US, so I'm not concerned about EPA/US registration issues.

I've ridden bikes with Spanish, French, and Italian registration into neighboring countries with my US passport, but those didn't require Visas, carnet, etc.

My question is: Am I going to run into a lot of logistical issues/questions/paperwork problems as I cross other borders with a US passport and a Mexican registration?

And before you start with the "Why not just buy a GS (had one), Super Tenere (have one), KLR, DR, whatever"... I'm just looking for an answer to this question. We can discuss all of that later!!!

Thanks!!!