I decided to research my statement above about Harley sueing over patent infringement. In 1996, when Honda came out with the Honda Ace 1100, it had a single pin crank (like a Harley) and it produced enough of a "potato-potato" sound that Harley did file a lawsuit and they tried to trademark the sound of a Harley. Harley gave up on the lawsuit and ultimately was not able to trademark the Harley sound.
In 1998, the Honda Ace 1100 (looks like a Harley Dyna-Glide) was replaced by the Honda Aero 1100, a retro-styled classic cruiser designed in the vein of old police bikes. It used the same motor with the single-pin crank as the ACE. Ultimately, Honda felt the engine design was flawed because the single pin crank caused too much bike vibration and a loss of 10 horsepower. After using the single-pin crank from '98 - '00, Honda changed the engine to a dual pin which gave it more horsepower but it also lost the Harley sound.
The '98, '99 and '00 Aero 1100's are a coveted bike by Honda enthusiasts because of it's remarkable similarity in sound to a Harley.
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I have heard an Aero 1100 and it sounds just like a Harley but I have also heard a Kawasaki 1500 Drifter that sounded even more Harley than that Aero. In fact, I heard that Drifter start up alongside of four other Harleys and the Drifter sounded "more Harley" than the Harleys did, on startup and on takeoff
For a Harley sound, I would choose that Drifter over any Harley I've heard.