Determining the "noisiest" motorcycle engine ever made is subjective and depends on various factors such as personal opinions, measurement criteria, and the context in which the noise is evaluated. However, there are a few motorcycles that are often considered to have particularly loud and distinctive engine sounds:
Harley-Davidson V-twin Engines: Harley-Davidson motorcycles, especially those equipped with large-displacement V-twin engines, are renowned for their deep, rumbling exhaust notes. These engines produce a characteristic low-frequency sound that is often associated with the Harley-Davidson brand.
Ducati Desmosedici RR: The Ducati Desmosedici RR is a limited-production road-legal version of Ducati's MotoGP racing bike. Its V4 engine is known for its high-revving capabilities and a distinctive exhaust note that can be quite loud and aggressive.
Yamaha VMAX: The Yamaha VMAX is a power cruiser that features a V4 engine. It has a reputation for producing a powerful, deep exhaust growl that is often considered loud and attention-grabbing.
Kawasaki Ninja H2R: The Kawasaki Ninja H2R is a track-only motorcycle equipped with a supercharged inline-four engine. It is known for its exceptional performance and a unique high-pitched whine from the supercharger, which contributes to its distinctive and loud engine sound.
It's worth noting that noise regulations and standards vary between countries, and many motorcycles are designed to comply with specific noise limits. Additionally, modifications or aftermarket exhaust systems can significantly alter the sound produced by a motorcycle's engine.