The photo is only 120 pixels wide, Paul, the file is only 3 kB and each pixel looks like a golf-ball on the screen. Can you post a higher definition version please?
I haven't yet found an illustration of that variant of the HDA carburetor that could tell me what is happening. The process for getting a 4-hose system working without a manual, is likely to take quite a while.
You might take a look at this 4-hose system on an HDA carburetor much the same as yours:
http://www.abbysguide.com/ope/discussions/65496-0-1.html
