Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 362Get this manual
11)With the power tilt assembly inclined to the side, push the 'UP" side of the power tilt switch and extend the piston rod as far as it goes12)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 [I] Extend fully
Add ATF up to the edge of the oil filler port
13)Set the power tilt assembly uprightUsing syringe or equivalent tool, catch the ATF flowing out of the oil filler port of the oil tank until the fluid level is at the edge of the filler port14)Check whether the ATF level is at the edge of the filler port