I have a new helmet that will keep the noise very well, so you can better perceive the light-sounding engine sounds. When I give gas, you can hear a slight “tack”, when the clutch is pulled, or when it is idle, you can hear nothing. The noise is speed-dependent and can be heard in every gear. The noise is quiet and maybe normal!? If you turn the engine up in the stand, you can hear nothing, so it should probably come from the drive…Primary? What could that be?