Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 344Get this manual

Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 344

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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