Hey DoGOV,
Not really being helpful here, but wanted to thank you for your videos. I am not a motor head and I know I will need to change my rollers and belt soon, and having seen what it looks like apart will really help.
Thanks for posting, I don't have the equipment necessary to record video for my en devours, but that sound you hear sounds familiar a little. When I get to top speed ~40mph restricted I hear like a Cicadas sound -->
which is pretty close.
Again, thanks for the videos, I just changed my oil for the first time today, so that tells you how new I am to this. Also, looks like we have about the same miles on our bikes, I wish mine looked as good as yours.