08-13-2019, 12:45 AM
i was wondering something similar to this, though I don't have even 1/10th the mechanical knowledge of the OP. I noticed i could hear a more pronounced sound that I assumed was the sound of the valves while idling after i opened up my exhaust and removed the 'cat. It's a noise i could hear on videos of other bikes with open exhausts, though, so i determined it was normal. maybe it's time for a valve check...
