I'm not too surprised by the actions of the RAC; it is nearly 50 years since I called them out to a motorbike breakdown - and that's a long story that is 
I agreed with your idea of calling them out because you seemed to be at a distance from home base (as I was).
18 pins or 21: well the website I found was US based so it may deal with a different, "export", model of ybr; after all, all bikes are export models to some market or other.
I would start with the simple possible answer; the plug terminals. It's not as if it is an old bike.
I've recently written in another thread that there would be value in a new thread about modern bike electronics and the diagnostics available; I don't feel that I know enough to start it, but I sure would like to read more!!
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Dave
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