1988 Johnson Evinrude "CC" 9.9 thru 30 Service Manual, P/N 507660, Page 115Get this manual
Disassembly INotel Do not disassemble leaf plate assemblies unless leaf plate seats, leaf valves, or leaf stops are damaged or corroded f6l
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 INotel All 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, switch the leaf valves
Used leaf valves must not be turned over for reuse Leaf valve may break when returned to service, causing serious powerhead damage12687
2 If 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 Do not lap leaf plate on lapping blockIf plate is too smooth, the leaf valves may stick closed after off-season storage