1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Manual, Page 94Get this manual
Disassembly
INotel Do not disassemble leaf plate assemblies unless leaf plate seats, leaf valves, or leaf stops are damaged or corroded
1Remove one screw and nut per leaf valve and remove the leaf plate assemblies as required
2When disassembled, keep the stops and leaf valves separated by assemblyAssembly
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intake manifold components must be perfectly clean before assemblyDo not use strong carburetor cleaner or hot soaking tank
1Place leaf valves on leaf plateIf new valves do not seat on the leaf plate, turn the leaf valves overleaf valves must not be turned over for reuseLeaf valve may break when returned to service, causing serious powerhead damage
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2If 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