Hi, New here, I have a Sears Craftsman lawn mower, with a Briggs and Stratton engine, There is no throttle, just full auto on the carburetor. The mower will start but quickly die, Seems to be fuel issue. I have checked air filter, sparkplug, etc, the problem I have is that the top of the carburetor is just a combination of plastic levers with a spring and two connecting rods that control choke and engine speed. It does not seem to be a blockage. I have no idea how to repair this. I have included a photo of the top of the carburetor. it appears to be a 796608 model carburetor. Any help?