Every motorcycle must at all times be equipped with a muffler in good working order and in constant operation to prevent excessive or unusual noise.
Source: AAA Motor Law Digest, 68th (2002) Edition.
Anyone who operates a motor vehicle or motor-driven cycle on public roadways in South Dakota is required to have a driver license. You are required to have a South Dakota driver license if you live here for more than 90 days. If you are a commercial driver license holder, you must apply for a South Dakota license within 30 days. The following people can drive on a valid license from their home state, so long as they are at least 16 years old. South Dakota law (SDCL 32-12-39) states that every licensee shall have their Drivers License in their immediate possession at all times when operating a motor vehicle.
Military - Members of the Armed Forces on active duty or members of foreign military on temporary duty with the Armed Forces, as well as their spouse and children.
Student - Students who are here to further their education and who are considered a non-resident for tuition purposes.
Motorcycle License - To obtain a Motorcycle License, you must be at least 16 years of age and pass the vision, knowledge (car/truck and motorcycle), and motorcycle driving test. If a minor is at least 16 years of age, but under 18 years of age, they must complete the requirements of the Instruction Permit and have not been convicted of a traffic violation during the past six months prior to obtaining the Motorcycle License. The license is valid for 5 years, for a cost of $8.00 for car/truck test plus $8.00 for motorcycle test.
For complete licensing information, visit the Office of Driver Licensing's website.
Source: South Dakota Department of Revenue and Regulation.
For more detailed information on motorcycle rules and regulations see the South Dakota Codified Laws.