I am sorry, my mistake, the license I hold is a car driving license.

Concerning the bike, I'm a little bit worried to buy a second hand to make a roadtrip ... I don't know if I can trust it :s

250cc seems fine to me as we're in China, I don't plan to drive faster than 110/120kmh at any point, and I think 80 will be an average maximum. Well, what else could be the problem with a too heavy bike?
And the bike you show me doesn't seems really good for read trips in term of comfort (including bad roads), what do you think?

Thanks guys!