What is the reason why the gasoline generator can start but does not produce electricity?

If you can make sure the generator is good and not bad. But the reason why there is no power is because it has not been used for a long time, or it has been dragged to death during use. The principle of generator power generation is that wires cut magnetic fields to generate electrical energy. If it is not used for a long time or burns out during use, the magnetic field inside the generator is completely consumed. Without a magnetic field, it is not possible to produce electricity. My method is to suddenly accelerate and decelerate the throttle several times. Generally speaking, power will come out slowly.