Selling a Swing in GReece

I will again be taking an excursion through Europe in the Spring. I own an Swing registered in Ireland, and plan or riding as far as Greece. If possible, I will want to sell the bike in Greece. Do any of the European members know the rules for selling a bike registered in one country in another country when both are EU members?

I hear Greece is a broke country.....You may have trouble selling it there!