Hello, a 2000W generator and a 60 or 70 motorcycle gasoline engine as the main engine can meet the requirements.
If the motor is not powerful enough, it must be replaced with a larger motor to drive the generator normally.
According to the law of conservation of energy, it is impossible to increase the power of the engine by changing the diameter of the active and passive wheels. Otherwise, wouldn’t this call into question the law of conservation of energy? I hope this will help you. Thank you