Rickochet Try running some Starbright Startron enzyme fuel cleaner through it first
I saw your post too late. Already took an hour to pull the carburetor and strip it apart to spray it down. Seems to be running smooth now - I'll find out later when the boy mows the lawn 🙂. I'll try your suggestion next time though (he says with a bad back sore from bending over the lawn mower and stooping to change tools).
Edit to add - as I replied to this post I vaguely remembered a bottle of blue stuff in the garage that I had been adding to my gas can, but have forgotten to the past several times I've filled the can up. What is the blue stuff? Why it's Star Tron Enzyme Fuel Treatment of course!