Just goose the throttle after startup. Once the internal regulator senses sufficient RPM once, the engine can charge at idle for as long as necessary. It just needs a quick speed increase once to make the regulator kick in. Later-model internal regulators don't need the RPM jump- - - -just the older style ones.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!