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More engine mass would allow it to continue to rotate faster during the momentary drag put on it when the large surge hits the generator. But you are correct, the engine would be working harder all the time with something like that done.

The surge capacity of the generator doesn't seem to be limited by engine HP, but rather by the main breaker of the generator itself. Read this thread to see what I'm talking about...MEP-002A and -003A main breaker

Feel free to do the experiment, but just keep the head limited to 5 to 7 KW so you know you won't overload it. You know you'll always have plenty of power so the engine won't bog down when starting a large load :grin: