Fizz, it's not how much you put in, but the height of the air gap *above* the oil as you fill them, that's important. Reckon on best part of half a litre per leg, but it's the air gap you need to keep your eye on. In case it's not already clear (I'm sure it is) you need to get the forks out of the bike to do this. The forks must be upright, fully compressed with no springs in them to set the air gap.
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