Coleman® now offers a "solid state generator" here in tiny sizes like the one discussed. The implication from the sales literature is that the motor runs at "whatever speed" and drives a DC (or variable speed rectified AC) generator/alternator, probably with very little regulation of either engine speed or the DC output. A solid state electronic inverter provides the stable frequency/voltage output regardless of what the motor does.

But who believes advertising?

_{Why are all those hands going up?}

John