Checked my Hornet's chain slider today. Was filthy, so took it off and cleaned it & the swingarm, the gunk made it look like it was almost rotten, but all that came off and it's in perfect condition, so that went back on.
Also, the squeak coming from the back brake is worse now, it'll squeak loud enough at a particular point when wheeling it that you can feel it through the handlebars. I cleaned the rear caliper, pins, pots the other day which didn't really help. Hopefully rear disk isn't warped, it's practically brand new.
I've got a feeling that's what's causing the vibrations as well. Thought it was the chain slider which is why I did that, but it's all ok there.