1997 Johnson Evinrude "EU" 90 thru 115 90 CV Service Manual, P/N 507267, Page 86Get this manual
7Use sharp pencil to mark the edges of leaf valves
8Use pencil eraser to gently open the leaf valves to check the alignment of the valve over the portValves should be spaced evenly over portIf not, loosen mounting screws and reposition leaf valve
9After leaf valve is positioned properly, install remaining screwsTighten all screws evenly to torque of 25-35 inIbs(3-4 Nm)10Apply OMC Locquic Primer and OMC Nut Lock to the leaf plate assembly to manifold screws11Using new gaskets installed dry, position each leaf plate assembly and torque the screws to 25-35 inIbs(3-4 Nm)Installation