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Huh?
Most eco minded generators use a dc to ac converter and an electronically controlled throttle that ramps the engine rpms up and down as needed depending on the load. Since the output is done electronically the hz is the same regardles of rpms. Think of it as the gas motor is driving an alternator and that is powering an inverter.
The engine mods do the same across the board. Most small engines the exhaust is the most restrictive part because of the spark arrestor, noise damepning. The timing can be advanced by use of different keyways and some ignitions have some wiggle room to rotate the housing some as well as positioning of the magnetio to the flywheel.
You can also shave the block and or cylinder head to up the cr.
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