It's not brake related. Since there was no grease on the pin or cam, I was hoping it might have been chatter from the shoes. No dice. I opened the final drive today and found nice clean gears, lots of clean oil on them, and bearings that I cant detect any play in. Even with the drive shaft hanging 5 inches out of the bearing, it only has about .,04 inches (1mm) of play at the opposite end of the shaft. I'm not going to replace all them just to see if that fixes it. They would have to have notable play to produce this noise. I'm running out of things it could be. I guess I'll get a new set of weights for the variator. If that doesn't do it, I'm at a loss.