Can you post a picture of the carburetor, complete with air cleaner, Pete? Someone may have an old mower laying under four feet of pig manure in the back of the house-paddock, and not recognise the description, but that air cleaner is very distinctive - and I think the carburetor is the same for both horizontal and vertical crankshaft versions of the engine, if it's the one I'm thinking of.
Good one Grumpy four feet of pig manure jeez i hope they clean it first lol.