Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 190Get this manual
4) Apply engine oil to the piston pin, connecting rod small
11ARROW MARK
end I.Dand piston pin bore
5) Install the connecting rod the piston with the oil groove facing the opposite side of the arrow mark on the piston head6) Install the piston pin7) Install new piston pin clipAlways use new piston pin clip, never reuse the used clipSet the piston pin clip in the groove properlyDo not align the clips end gap with the cutout
OIL GROOVES
eINSTALLATION
1) Apply engine oil to the piston outer surface, piston rings