Looks like you have an Italian made 25cc Fox Motori "Scale Model" engine. You can verify that by seeing if the Walbro carb is model WA-212. If that's not it, its probably a converted Italian Fox Motori engine (made in Poviglio, Italy), and you can look up the specific engine from the number on the Walbro carb. Get the number, and go to this site for id.
http://wem.walbro.com/walbro/family.asp
Yes, the URL is correct - its not a www address.
Lynn