How to get a generator running after sitting for years?

Getting a generator running after sitting for years requires a thorough recommissioning process focused on fuel system, ignition, and lubrication. First, do not try to start it immediately, as old fuel and low oil can cause damage. Drain all old gasoline from the tank and carburetor bowl, as fuel older than a year is not usable and has likely turned to varnish. Remove the carburetor bowl and clean it, and use carburetor cleaner to spray through the jets. In many cases after years of sitting, the carburetor will need to be fully removed and rebuilt or replaced. Second, change the engine oil, as old oil contains acids and loses viscosity. Check and replace the air filter, which may be clogged with dust or mouse nests. Third, remove the spark plug, inspect it for corrosion, and replace it with a new one. Add a teaspoon of engine oil into the spark plug hole and pull the starter cord slowly a few times to lubricate the cylinder walls before attempting to start. Fourth, check the fuel lines for cracks and replace if brittle. Install fresh gasoline with fuel stabilizer. Finally, check the battery if it has electric start, as it will likely need replacement. Once running, let it warm up without load for 10 minutes, then apply a small load gradually.