Yikes! Glad you found the problem / got it apart.
Are these parts (including the shaft drive splines/etc.) pretty well greased from factory? Seems the factories are usually pretty skimpy on that to begin with, at least they were on my Suzuki bikes, but wasn't sure about Yamaha.
My bike is specialWOW ! I’ve never seen it that bad before
I have sealed the holes with epoxy after giving the cavity a bead blast. Hopefully that will do the trick.I am really surprised there are holes leading into that Bearing/Sleeve cavity (IMHO-there should not be)
I would definitely seal those with some sort of epoxy, or something permanent.
Thank you for the pictures and the write-up.
I will definitely be taking a good look at mine when I do the first major service and valve-check.
Fun Fact: On the 2019 Tenere, there's only one such hole entering the bearing cavity, located on the "brake caliper side" of the swing arm. The hole on the driveshaft side appears to have been welded up from factory.Looking inside the pivot housing there are two holes that go through to the hollow swing arm! This is a poor design as it allows any dust/ water and dirt from inside the swing arm to enter the pivot bearing cavity. I will be sealing these up with sikaflex and I suggest you all do to.
I didn’t bother in the end... I figured it would take 1/4 of a grease gun to fill the cavity and she’s heavy enoughDid anyone ever tap a grease zerk in the hole? I'm doing my swing arm today and was looking to benefit from another's experience...(with pics. of course...)