The noise only seems to happen when I am in the saddle. It is not peddling dependent. And I can make the noise happen while sitting still. Simply compressing the suspension does not create it, it is as though you have to get the frame to flex a bit. I say this cause if I am sitting still, on the saddle (left foot on something to hold me up, right foot on peddle at the 6 oclock position) I can put me weight on the left of the handle bar and weight the saddle in such a way that it makes the bike create the sound. Course simple solution... don't do that LOL. BUT when I am peddling apparently I have a way of moving my weight on the bike in such a way that it really gets the frame to sing. It certainly seems to be a weight distribution in the saddle dependent noise, and not suspension cycle dependent at all.
I THINK I know where it is coming from, and it is the pivot joint, I have a pic but I cannot get it to load right now). I THINK it is this joint because if I am riding or sitting still and get the bike to make this noise then I can "feel" the noise the best in this location (the vibrations made by the noise). In the rear triangle connected & housed at this joint is two sealed bearings that are pressed into the rear triangle. I spoke with my LBS last Saturday, course they did not see the bike, but heard my story and say the pics and video below. At any rate they confirmed what I thought and that is you have to destroy those bearings to remove them. There is no way to remove them and not mess them up.
So....... I guess this saturday I will take it in to let them deal with it, cause I certainly do not want to be the one on a carbon frame pulling, beating, pressing, and messing with those bearings. It is my belief at this time that it is either these bearings or the BB which I have my reservations about it being that. If this BB give me much lip.... I will punch that sucker out and throw in a wheels mfg screw in.
For giggles, here is what I have done myself to the bike trying to track this down....
-Removed cranks, greased, re-torqued chain ring after light greasing, and have adjusted preload about 12 times.
-Dropped fork and regreased the head set
-ensured axles where lightly greased, torqued, derailleur hanger torqued and lightly greased, derailleur is torqued also.
-Cassette is torqued
-infinity link was never removed, but the mounting bolts where torqued and the link itself was checked for lube
-ALL other suspension links and rear shock has been removed, greased where possible (can't grease exterior of pressed in bearings which is what I think the issue is), and have re-torqued everything to yeti spec.
-seat post was lubed with carbon lube, clamp lubed with regular lube, seat mount and bolts were lubed and re torqued, seat rails received a light coat of grease.
here is a video: Yeti Creak