Buying Bike in Brazil in Brazilian's Name
 

I will be going to Brazil in early 2016 to go on a South American tour for a few months and had a few questions concerning buying a motorcycle. I have a Brazilian girlfriend that is more than willing to allow me to to buy the bike using her CPF number, so that is no issue.

My question then is after buying it do I have any ability to register in my name or must it be in hers? Also, if it must be in hers is there any way that I will be able to cross borders? Thanks for any help

With a power of attorney that states that you can use it in her name you shouldn't have any problems crossing borders. I haven't had problems with mine.
I have got a Spanish and a Portuguese one, I could send them to you if you want an idea of what it says.