Small engine maintenance is not taught anymore. I used to work for a lawn service company who would make every lawn-mower remove and dismantle, completely, the carburetor and gas tank from his mower, clean it out, and reassemble it. You were given the manual and three hours. They figured if you weren't smart enough to get it on and running by then they could find someone else. The owner had a heart attack and dropped dead and the kids decded this went against modern management principles. Plenty of workers who "weren't mechanics" could mow lawns fine, and would work cheaper, so T.J. and Wilbur-two old hardasses we had working there for years-were replaced by Juan, Hector and Pedro who proceeded to put them out of business promptly.
There is no feedback system and oxygen sensor-they are gravity bowl carburetors wholly dependent on the specific gravity of the fuel, and air absolute pressure, temperature, and humidity. Setting proper fuel mixture is something needing to be done every time there is a drastic change in any of the above on a B&S or Tecumseh. Never seen a Honda close enough to know.
Hint: Learn to read spark plugs. Get the Champion magnifier and the catalog.
Second hint: Small engines are built cheap, cheap, cheap. Automobile gas has changed and fuel system materials haven't. Unless you can find better seals, gaskets, et al aftermarket, the stuff in car gas for EPA will attack these. If you can find 80/87 avgas locally, it's worth the extra buck a gallon.