Thanks Kev. Not trying to be smart because I'm not, just getting old, but I've set screw tappet valve clearances on various bikes for more than 40 years now (Brit stuff at first, then mostly Jap singles from XT500 onwards, and a string of [gasp] 610/570 Huskys), and none that I know of had this feature readily available, so I was curious as to why the Tenere does.

In general, I've just removed the tappet cover, and watched for the inlet valves opening, then set TDC when the flywheel mark next arrives in the port.

So what I was getting at, I guess, is that it's not a requirement to line up the cam sprocket mark, just an aid, and you've cleared it up, so thanks again for that.