I'm sure this will be the daftest question ever asked .. but hey!
Just servicing the XT660Z and I took the spark plug out and there isn't a terminal nut on the top (just the threads). Is that how it is meant to be, or has the nut come off and is still inside the plug cap? I've had a rummage and a fiddle but can't see anything left behind. I put the plug back into the plug cap and it isn't a great fit.
Thanks ...

Mine is just the same mate, thats how they are nothing to worry about. Just make sure the HT cap is pushed all the way down covering the white section of the plug. And the only silly question is the one you never ask

Thanks for that!!!