I was always planning to replace it, in order to minimize down time. I rely on my FJR for daily transport so I needed to get it fixed ASAP. I offered to send you my broken stay since I read your post about working on a stiffy type kit for it. If someone out there wants to buy my broken stay, and...
My 2015 was sadly tipped over in my driveway... and as a result my front stay broke, which causes the mirror to be flimsy. Since I was going to replace it, and since there seems to be limited how-to instruction out there on this topic, I created a how-to video on YouTube. I hope it helps you.
Its possible one or more of your plugs is internally damaged. Perhaps torqued too tight or poorly manufactured. As a result spark is was not getting to the cylinder.