Why is a two stroke so loud?

A two-stroke engine is typically louder than a four-stroke engine due to its design and operation. It completes a power cycle in just two strokes of the piston, which means it fires once every revolution, resulting in more frequent exhaust pulses. Additionally, the absence of a dedicated exhaust valve allows for less efficient exhaust scavenging, leading to a louder and more abrupt exhaust note. This combination of factors contributes to the characteristic high noise levels associated with two-stroke engines.