Hi aldot, the colour of Briggs engines does not give us the model. You might be talking about a suction fuel feed 130902, like in this Operator's Manual:
http://bsintek.basco.com/BriggsDocumentDisplay/msotJO-K_ny7tH217FzoPu.pdfOr you might be talking about a gravity fuel feed 130702, like in this one:
http://bsintek.basco.com/BriggsDocumentDisplay/flivBCX-nfBhU7y.pdfIf you can clear that up, I still will need to refer you to Joe Carroll for extensive hands-on experience with the model, but at least he'll be talking about the right engine. All I can say is that there is a vertical 5 hp, often white, which I seem to recall some of the members being quite fond of, but I think you probably want something more specific than that.