Laws regarding revving motorcycle engines can vary depending on the jurisdiction and local regulations. In some areas, revving an engine unnecessarily or excessively may be considered a form of noise pollution and can be subject to legal restrictions. Many places have noise ordinances in effect, which set limits on the amount of noise a vehicle can produce.
To determine whether it is illegal to rev your motorcycle engine in a specific location, it is best to refer to local traffic laws and noise regulations. These laws can differ between cities, states, and countries, so it's important to familiarize yourself with the regulations in your area. Law enforcement agencies or local government offices can provide specific information regarding the rules and regulations pertaining to revving motorcycle engines in your jurisdiction.