Generally, 2-stroke motorcycles tend to produce a louder sound compared to 4-stroke motorcycles. There are several factors that contribute to this difference in noise levels:
Engine Design: The fundamental difference between 2-stroke and 4-stroke engines lies in their design and operation. 2-stroke engines have a simpler construction, with fewer moving parts, as they complete one power cycle in just two strokes of the piston (compression and combustion/exhaust). In contrast, 4-stroke engines have a more complex design, with separate intake, compression, combustion, and exhaust strokes. The simplified design of 2-stroke engines can result in more pronounced mechanical noise.
Exhaust System: The exhaust system of a motorcycle plays a significant role in determining its overall sound. 2-stroke motorcycles often have less elaborate exhaust systems compared to 4-stroke motorcycles. The simpler exhaust design of 2-stroke engines may contribute to a more direct and louder exhaust note.
RPM Range: 2-stroke engines typically operate at higher RPM (revolutions per minute) compared to 4-stroke engines. The higher RPM generates a faster succession of combustion cycles, resulting in more frequent exhaust pulses and a higher-pitched exhaust sound.
Muffler Design: The design of the muffler or silencer also affects the sound produced by the motorcycle. Manufacturers may design mufflers to amplify or dampen certain frequencies, affecting the perceived noise level. However, in general, the inherent design characteristics of 2-stroke engines contribute to a louder exhaust note.
It's worth noting that variations in motorcycle models, engine sizes, aftermarket modifications, and local regulations can all influence the sound produced by both 2-stroke and 4-stroke motorcycles.