Hi Ed, two major problems with you plan unless you are talking about a bicycle (bike).
1: You will not be able to buy a motorcycle in Brazil without a Brazilian Cadastro de Pessoas Fisicas (CPF). This can be obtained but you will need to have a Bank Account and then there is license, registration and insurance. (all of which will be a big headach and take much time).
2: There is no such thing as a cheap motorcycle in Brazil! 
If you are talking about a bicycle, please ignore the above.
Sorry to rain on your plan. 
You may want to look into buying from someone who is ending a trip in South America and not planing on shipping the motorcycle home or buy something in some other country. Search the forum and you can find info on buying in SA.
Blaze
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