2001-2014 Honda BF/BFP8D, BF/BFP9.9D Outboards Shop Manual, Page 350Get this manual
BF80-BF9.90 8) Apply ATF to new O-ring, and install it in the lower groove in the outer tube9) Apply ATF to the new dust sealHolding it with your fingers so that it shapes "U" and install it in the upper groove in the outer tube
DUST SEAL
O-RING 2.4 12.3 mm
10)Attach thin sealing tape around the threads at the end of the piston rod 11) Install the cylinderpiston assembly in the outer tube If it is hard to install the piston rod end in the outer tube, apply the ATF to the piston rod endthen insert the piston rod into the outer tube by turning the outer tube Take care not to push the piston rod into the cylinder with force When the piston rod is pushed into the cylinder with force, push in the free piston in the cylinder as full as it goes with the threaded part of the piston rod facing down and by holding the outer tube and cylinder securely12)After installationremove the sealing tape from the threads at the end of the piston rod Attach thin sealing tape around the threads OUTER TUBE