Greetings, I just got my BD last week, (I have some "Chunky Shit" in my tank too) I was doing the second fill up and I noticed some kind of material just below the tank neck, it appeared maybe to be a greenish color but hard to tell. I could however tell that it was in the shape of something that had been in that tank as I could see impressions on it as it was hanging over the side getting ready to splash down into the tank. I managed to get a few small pieces of it and as soon as it was in the air it turned hard, the rest diapered into the tank-is this what this "tank liner"? Whatever it was it seems like something that will be back. If it is something that should not be then it will be warranty not me taking the tank off.
I obviously do not know a lot about bikes/mechanics as up until now-with this investment I have been content to just ride them-now I am trying to learn a little about what is going on.
Thanks, "T"