Uploaded November 2024 | Updated September 2026, 1 week ago
Note that the valve is fully open (anti-clockwise, against the stop) the vast majority of the time, only closing when the bike is at low speed and pretty much at idle. This confirms that the valve is for noise control, rather than any back pressure / resonance tuning for performance.
Note that the valve is fully open (anti-clockwise, against the stop) the vast majority of the time, only closing when the bike is at low speed and pretty much at idle. This confirms that the valve is for noise control, rather than any back pressure / resonance tuning for performance.
