The American Motorcyclist Association (AMA) created model legislation to evaluate on-highway motorcycle sounds through science-based measurement, according to the AMA.
It's based on the Society of Automotive Engineers' (SAE) new J2825 standard, “Measurement of Exhaust Sound Pressure Levels of Stationary On-Highway Motorcycles.”
The AMA produced similar model legislation for off-highway motorcycles several years ago.
The model legislation adopts the SAE J2825 standard for stationary on-highway motorcycle sound testing, specifies the type of sound meter to be used and allows for each city to specify the penalties for violating the law.
Under the SAE J2825 standard, decibel limits range from 92 dBA at idle for all motorcycles, to up to 100 dBA at certain RPMs for various motorcycles, depending on the type of engine.
The model legislation can be downloaded from the “Rights” section of the AMA Web site at AmericanMotorcyclist.com.