1997 Johnson Evinrude "EU" 9.9 thru 30 2-Cylinder Service Manual, P/N 507263, Page 83Get this manual
Disassembly
INote Do not disassemble leaf plate assemblies unless leaf plate
seats, leaf valves, or leaf stops are damaged or corroded
1Remove two screws per leaf valve and remove the leaf valves as required2When disassembling leaf plate assemblies, do not lift or bend leaf valvesRemove the leaf stop screws and remove the stops, shims, and leaf valves3When disassembled, keep the stops, shims, and leaf valves separated by assemblyAssembly
INote All
intake manifold components must be perfectly clean before assemblyDo not use strong carburetor cleaner or hot soaking tank1Place leaf valves on leaf plateIf new valves do not seat on the leaf plate, turn the leaf valves overover for reuseLeaf valve may break when returned to service, causing serious powerhead damage2If any leaf valves are standing open, apply light pressure using pencil eraserIf leaf valve closes with light pressure, valve is acceptableIf not, inspect leaf plate for high spots or burrs