Even though I've only got one key (bike key) on key ring the yoke still seems to get marked. Has anyone seen any decent solutions?

Duct tape. How are you managing to mark the yoke on the Tenere? The key sits so far away?

I have put a couple of strips of insulation tape on my tank, as it was getting marked by the GIVI top box key.
Crusty

If you buy two tank protectors from yamaha you can cut one to size and it follows the contour of the tank and fits like a glove .
The cheaper way is to buy one and us the paper off the back as a template and get some black moulding tape and cut round it and that also does the job . Hope that helps & let me know how you go .

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Great thanks, doh I didnt mean a yoke protector did I?

Yeah just the tank area that sits next to the barrell. I'll try the suggestions above