1992 Johnson Evinrude "EN" 9.9 thru 30 Service Manual, P/N 508142, Page 101Get this manual
Disassembly Do not disassemble leaf plate assemblies unless leaf plate seats, leaf valves, or leaf stops are damaged or corroded
!sl 1Remove one screw and nut per leaf valve and remove the leaf plate assemblies as required2When disassembled, keep the stops and leaf valves separated by assembly
Assembly
intake manifold components must be perfectly clean before assemblyDo not use strong carburetor cleaner or hot soaking tank
rjl 1Place leaf valves on leaf plateIf new valves do not seat on the leaf plate, turn the leaf valves over