re: Is revving a Harley Davidson up and down the only way to keep it running at a stop sign?

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Is that a design feature of that engine?

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there is a legitimate reason to do it, but thats not why they do it, they do it because they think its cool to be load and obnoxious as possible.

as far as the engines, motorcycle engines only run with around 5 lbs oil pressure, so at idle little to no oil reaches the top to lubricate the camshafts. for this reason its best to bump up the throttle every few seconds at stop lights, so it gets all the oil it needs