I'm testing the machine. This is what I did: stick your little finger in the high voltage box and pull the handle. If you feel an electric shock, the high voltage box is good (non-professionals can't do it). The voltage package is good, you can go to the next step: 1. The ignition intensity may not be enough. You can adjust the ignition gap of the spark plug to about 0.7mm. If that doesn't work, adjust it a little smaller, but don't touch it. 2. The engine oil level may be low or there may be a problem with the carburetor protection line (remove it, it's basically useless) 3. The insulator is broken. 4. It is also possible that when you checked the spark plug for ignition, you did not touch the spark plug housing to the aluminum housing of the generator.
If your machine has been stored too long, you can remove the spark plugignition, inject gasoline (1/5 of disposable gasoline) into the spark plug hole, install the spark plug and start it, which can basically solve the problem.
Where did you purchase the generator? Will they not provide you with service?