Euro5 here or there, noise reduction to the end, at Yamaha they know that sound is important to motorcyclists. It's simply part of the experience, even for those who aren't looking for extremes. We usually hear this from the exhaust side, but there is another sound that is pleasing to the ear. A more important, but crucial, source, like the bass guitar in rock music, is the suction sound. Yamaha realized this and came up with the idea of developing the MT-09 in this area.
The essence of the development during the patent filing phase is not primarily to amplify the intake sound, but to direct it towards the engine driver. This is in line with what was called Jin-Kei Kano's philosophy when the 2024 MT-09 was introduced, which was to prioritize sensory stimulation for the motorcyclist. Understood in Hungarian, emphasizing that a motorcycle is not only a means of transportation, but also a means of entertainment. Or maybe more than that.
Yamaha achieves this through a modified airbox design, where the air intake duct emphasizes high-frequency sounds. This sound is enhanced by a mesh-covered outlet hole, which is positioned above the tank towards the rider. It actually looks like a speaker output, but only until someone removes the protective grille. Naturally, the return of water and raindrops must be prevented, so extending the plastic tank ensures vertical protection from the weather.