2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Manual, Page 166Get this manual
FUEL SYSTEM INTAKE 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 gasket surface must be flat, 0.003 in(0.08 mm) Remove two screws per leaf valve and remove the leaf valves as required
9.9115 Model
When disassembling leaf plate assemblies, do not lift or bend leaf valvesRemove the leaf stop screws and remove the stops, shims, and leaf valvesWhen disassembled, keep the stops, shims, and leaf valves separated by assembly
IMPORTANT: The 9.9 and 15 leaf valves are not interchangeableThe thickness of the valves is not the same