The workshop manual doesn't state the fill volume, instead it states that the fork tubes should be filled to a level 150 mm (Marzocchi) or 120 mm (Kiafa) below the top rim of the fork, with the spring not installed and the fork all the way extended. It also states that after filling partially, you should compress and extend the fork a few times and wait a few minutes to make sure the oil penetrates all the passages, before the final filling. The fork should be exactly vertical when measuring. Good luck!