Import to Brazil

hi... I wonder how I can buy a bike kx250f in the United States of America or in China and bring the bike to Brazil with certainty that she checks up to me and not get stopped in customs, I would like to know which documents to import and value rates, and would not be necessary because emplacar and a motorcycle off-road this bike costs around $ 3500.00 thanks .

Company:smalcell celulares ltda
First Name: mateus
Last Name: assuncao
Phone:
Email: mateus.assuncao@hotmail.com
Phone: 555555555555
Address: r raimundo
City: bh