Honda BF15D BF20D Outboard Motors Shop Manual., Page 121Get this manual
13)Connect the SE thermal valve wire connectors and secure the wires with the clamp on the starter case (Electric starter type) 14)Install the breather tube between the silencer and cylinder head cover15)Clump the tube with the 13 mm tube clip (electric starter type)16)Reinstall the right engine under cover (P5-2, 3) and engine cover-