Thanks all for the replies and the welcome!
Muskrat, when you talk RGS refers to Gold Rock Star? The carb I'll trade for Amal.
Scotty, I'm from Rio and I live in Teresopolis, 100 km from Rio de Janeiro. Your country is great!
Fido, thanks for the comments. I believe it is not hard to put the fixture for center bolt of the tank. Which photos you need to see better?
I passed by the numbering, I can identify the model? Some detail in the frame and engine that helps?
The wish is to leave the original as possible ...
Regards,