1999 "EE" 90, 115 FFI, 150, 175 V4, V6 FFI Outboards Service Repair Manual, P/N 787024, Page 122Get this manual
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8 Use 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