I was going to post this over on the Reference and FAQ forum because I have seen no reference to it here.
Season before last, I noticed a crack starting across the bottom of the right kneeplate of my Hondaline fairing, right about the time I noticed that it was shaking quite a bit more than I remembered.
I had recently done some work that involved taking the fairing loose from it's mounts, and figured I'd just forgotten to tighten up the mounting bolts. Checked it out, that wasn't it at all...In fact, I couldn't see any reason for it whatsoever.
There are alot of GL1100's in my area, and I started looking around at rides and rallies, and noticing that a fair majority of them were cracking out in the same place, but nobody seemed to know why. Caused me to assume that maybe after 25+ years, the palstic had just gotten weak and cracked out.
Did a quick epoxy with microballoons and fiberglass fiber repair to the inside, and all was right with the world again...for about 4000 miles, then the repair broke loose.
Pulled the fairing to do a more thorough repair and I found that the mount itself was loose. Ok, hit the visible bolts, all tight...but the mount still flopped around with little pressure. Finally chased the upper mounts to where they mount to the frame underneath the tank shell and found the nut in the picture below MISSING COMPLETELY.
Pulled the tank shell, replaced the nut with a nylon insert nut coated with purple Loc-Tite, fixed the fairing with some really heavy fiberglass cloth that I had from repairing a boat hull a few years back, and epoxy along the mount plate and rolled over to the inside...and all is right with the world again.
After that I started checking some of the bikes with the cracked out fairings that I still saw at rides and rallies, curling my fingers over the front of the tank shell and finding the end of the bolt...and no nut!
I've made it a point now that every time I get to talking to another gOldwinger, I mention this nut, and show them where it is. If it's still there, I recommend to them that they also replace the stock nut with at least a nylon insert nut the next time they're under the shell. If they don't want to do that, at LEAST put a wrench to it and make sure it's tight...It'll save your fairing!