Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 199Get this manual
10) Apply oil to the threads and flange surfaces of the 28 flange bolts and tighten them to the specified torqueTighten the bolts in the numbered sequence shown insteps TORQUE: 14 Nm (1.4 kgf-m, 10 Ibf-ftl
11) Apply engine oil to the piston outer surface, piston rings and cylinder wall12) Set the piston to commercially available piston ring compressorInstall the pistons with the arrow mark on the piston head facing upTake care not to damage the piston rings and cylinder wall
111 PISTON RING COMPRESSOR (Commercially available)