Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 361Get this manual
7) Lean the power tilt assembly to the side as shown with
the piston rod fully compressedPush the "UP" side of the power tilt switch and extend the piston rod approximately 50 mm (2 in) from the end of the piston rod8) With the power tilt assembly inclined to the side, add ATF to the oil tank slowly until the fluid flows out of the oil filler port by using syringe or equivalent tool
11I Extend approx50 mm from the fully compressed position
121 Add ATF up to the edge of the oil filler port
Push the "UP" side of the power tilt switch with the power tilt assembly inclined to the side, and extend the piston rod an additional 50 mm from the end of the piston rod10)With the power tilt assembly inclined to the side, add ATF