Hello,
Thank you for your answer.
It is rather difficult to find in Europe an NSR under 4500 Euros, and they are quite rare.
I had already seen the irish NSR, but it has japanese papers and I must make the import by myself, not knowing if it has all the necessary papers for France customs.
I have another problem : The NSR was not imported in France, and the only way to obtain legal papers is to get "oldtimers" papers.
That means the bike must be 30 years old. So practically, only an MC18.

Where I found the first bike, they have 2 other better MC18
https://motoconcess.com/?Recherche=&IDRegion=&Categorie=&Motorisation=&Chassis=&Marque=HONDA&CylindreeMin=250&CylindreeMax=250&BudgetMin=&BudgetMax=&AnneeMin=&AnneeMax=1990&TypeOrder=DateMiseAJourAnnonce&Order=DESC&affichage=#form

Perhaps these are more worthwhile ?
Sincerely