A used bike would allow us to sidestep the problem of registering the bike in our name, plus maybe save some money and the 'teething problems' associated with poorly assembled new bikes. What are the sites for classified ads in the area around Guangzhou?

I guess we would try to get a notarized translation of the Bill-of Sale (into Russian and English), with photocopies of his and my passports. Also translations of the registration documents. Hopefully this should be enough for the border crossings.