I have a Walbro 59 (stamped in the carburetor), I'm putting it back together from pictures. I have a picture, not the greatest, despite being large, but it shows what appears to be some sort of 'plug' or 'cover' over one of the ports. I can't recall removing it, nor can I find it among all the parts in the container. So I'm not sure if it's gone walkabout or is something else altogether (screen maybe).
I had a look at a carby now I know what trimmer it comes from and it's meant to be blocked off.Your image looks like it's blocked off
as it should be.
I haven't had a good look at the gaskets but the hole in the metal plate may be an air bleed for the gasket to work like a diaphragm.
Cheers
Max.
