There is a good chance that there is some slight meaningless difference between this bike and the model that was manufactured for sale in the US. In which case it is quite likely that he will be unable to license it here under any conditions. Your friend could get the vin # and particulars on the bike and go to the local DMV and ask them. Odds are good that the DMV will lie to him and he won't figure it out until he buys it, gets it shipped and discovers that they won't let it through customs.
Given that your friend hasn't actually checked out the bike in person, that the seller is probably completely safe from any recourse from your friend if he just takes his money and stops returning his email (I mean how does your friend know the guy actually has a bike to sell, and is not just showing him some bike pictures he pulled off the internet?), and that there is a good chance that licensing will be either impossible or a nightmare...
I would suggest he just buy 2400 lottery tickets and hope for the best.
Hooligan