1993 Johnson Evinrude "ET" 90 degrees CV Service Manual, P/N 508285, Page 83Get this manual
7Use sharp pencil to mark the edges of leaf valvesthe alignment of the valve over the portValves should be spaced evenly over portIf not, loosen mounting screws and reposition leaf valve9After 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 1Using new gasket installed dry, install the intake manifoldTorque the screws evenly to 60-84 inIbs(7-9 Nm)2Install the throttle cam and linkage3Route and connect the crankcase recirculating hosesRefer to Hose Routing chart, this section 4Following steps listed in Carburetor Installation, this section, install carburetors5Refer to Synchronization and Linkage Adjustments, Section 1, for adjustment information 71 8Use pencil eraser to gently open the leaf valves to check