Well, yes and no....
Meaning you have no external voltage regulator, but your engine has an alternator under the flywheel that,
when the engine is running, puts out a fixed voltage solely designed to keep the battery charged.
And you only need the battery to start the engine. So that's your regulation.
The alternator also has separate windings that put out a separate voltage strictly for your headlights.
The spark for your spark plug is magneto generated, so you don't need any battery voltage for that.
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