The flicker often seen in lights powered by a generator pulled by a 2 cylinder Deere tractor is FREQUENCY distortion. It is caused by RPM variation between power and non-power portions of crankshaft rotation. As generator voltage output is proportional to RPM it can cause a visible flicker in incandescent lights as the RPM varies up and down with each pair of power strokes.
It's most noticeble with the slowest turning diesels (R, 80, 820, etc) and less noticeable with the higher RPM small gassers (H, M, 40, 420, etc). And it's essentially non-existent on a generator pulled by a fast-spinning 6 cylinder like a 4020.
Incidentally HARMONIC distortion is the distortion of current/voltage waveform from an ideal sine wave. You need an oscilloscope or other waveform analyzer to detect it. Harmonic distortion does not cause lights to flicker.
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