Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 344Get this manual
6) Remove the piston rod and free piston from the cylinder 7) Remove the O-ring from the piston rod and discard itReplace the O-ring with new one during reassembly8) Remove the backup ring and O-ring from the free piston and discard themReplace the backup ring and O-ring as set during reassembly[I] O-RINGS Do not reuse
[2] CYLINDER
[4] FREE PISTON[5] BACKUP RING pzxiq
9) Remove the dust seal and O-ring from the outer tube and discard themReplace the O-ring and dust seal with new one during reassemblyVALVE BODY