Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Julie,I have puzzled over the same question in the past and convinced myself that the answer is nothing ! Doesn't seem logical that Honda would have fitted something that adds cost and weight for no reason even if it was already a production tooled part from another bike, but I have never been able to find any use for the horizontal part of the bracket, and their description doesn't help !! The end of that part of the bracket looks shaped to suit a rubber holder of some sort (like the starter relay bracket) but nothing I can think of - maybe something for the US market ?
By coincidence I have just zinc plated the one on my USA early 400/4 and it does have a rubber strap with wire loops attached - a bit like a smaller version of the battery strap and that supports the wiring loom to the lug on the frame. As far as it being called stay, speed unit, did the Jap (or other markets) version have one of those red light jobs (in the speedo) for 100kph. My GB400 and GB500 had them plus a Jap spec Yam XJR1200. Might have been some kind bracket for that.Ian