A single cylinder Briggs and Stratton engine has:

A single cylinder Briggs and Stratton engine typically has two valves: one for intake and one for exhaust. This valve configuration allows for the effective management of air and fuel entering the cylinder and the expulsion of exhaust gases after combustion. The design with two valves helps in achieving a balance of performance and efficiency, making it well-suited for small engines commonly found in lawn mowers, portable generators, and other outdoor power equipment.

Engines with a simple design are able to maintain reliability while providing sufficient power output for varied applications. While other engines can have different configurations, such as one valve or more than two, the typical setup for a single cylinder Briggs and Stratton engine is indeed two valves, which is key to its functionality and efficiency.