Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 351Get this manual
1) Clean the parts in fresh ATF, and blow each port of the parts with compressed airCheck that the parts are free from contamination with dust and dirt before reassembly 2) Apply ATF to new O-ring, and install it on the valve B3) Apply ATF to the valve and install the valve in the valve body noting the installation direction4) Apply ATF to new O-ring, and install it on the sleeve
5) Set the new backup ring on the spool valve and apply ATF to the outer surface of the spool valve6) Install the spool valve in the sleeve noting the installation directionc
131 SPOOL VALVE
7) Apply ATF to the sleeve, and install the sleeve in the valve body noting the installation direction