Harley-Davidson motorcycles are known for their distinctive exhaust notes, and some riders do rev their engines to produce a loud sound. However, it's important to note that not all Harley riders engage in excessive or unnecessary revving. Revving the engine can serve various purposes, such as warming up the motorcycle before riding or signaling one's presence to others on the road.
It's worth mentioning that there can be a subset of riders, regardless of the motorcycle brand, who may rev their engines loudly for attention-seeking or display purposes. This behavior, commonly referred to as "loud pipes," is not exclusive to Harley-Davidson riders and can be found among riders of different motorcycle brands.
Many areas have noise regulations in place, and unnecessarily loud revving can be seen as a nuisance or disturbance. Responsible riding entails being mindful of others and maintaining a considerate noise level.