2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 168Get this manual
FUEL SYSTEM INTAKE MANIFOLD
INTAKE MANIFOLD
Removal
Remove carburetorsRemoval on p162Refer to Carburetor Remove manifold screws and manifold
Inspect the intake manifold: All gasket surfaces must be smooth and free of nicks Use machinist's straightedge to check for flatness in all directionsThe mounting surface must be flat, 0.004 in(0.10 mm) Balance passage must be free from any restrictions
Disassembly
Remove the two screws on each leaf plate assembly, and remove the leaf plate assemblies as required
IMPORTANT: Do not disassemble leaf plate assemblies unless leaf plate seats, leaf valves, or leaf stops are damaged or corrodedIMPORTANT: Check parts availability before
servicing leaf plate assembliesAssemblies on some models are not serviced in detailWhen disassembling leaf plate assemblies, do not lift or bend leaf valvesRemove the leaf stop screws, and remove the stops and leaf valvesWhen disassembled, keep the stops and leaf valves separated by assemblyCOB1109C OB1110