| Hi,
I think mine are set at about 3 rings showing above the yoke, but it depends on what shock you've got in the back and how much you weigh/how old the shock is/when it was last serviced.
If the shock is in good nick and set for roughly your weight range, the oil in the forks is still reasonable, and the springs haven't sagged then I'd go with between 2-4 rings showing. If you want it slightly sharper then find a way to increase the rear ride height c.10mm and push the forks down until they are flush with the yoke. Not too tippy and drops into corners miles better.
Cheers,
Ali | 
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