1978 Johnson 55 HP Outboards Service Manual, Page 29Get this manual
bCheck for correct positioning of floatTurn carburetor body upside down so weight of float closes needleTop of float should be parallel and 116" (16 mm) above gasket surfaceSee Figure 3- 20cReassemble float chamber to carburetor bodydReplace the high-speed orifice plug and drain plug CHOKE Check the choke for free operationmust move freely, without bindingChoke valves
Figure 3-20Float Level LEAF VALVES aThe importance of keeping the leaves in these valves free from distortion cannot be over-emphasizedReplace any leaf valve assembly which shows any indication of distortion or damage of leaf stopCheck leaf plate with scale for distortionbThe leaf is so designed that it maintains constant contact with the leaf plate, and will spring away from the plate when predetermined pressure is exerted against itLeaf travel away from the plate is limited by the leaf stopWhen pressure is removed, the inherent spring action of the segments returns and holds them against the plateAttach the leaf segments and leaf stops to the leaf plates, then examine each leaf carefullyEach leaf must lie flat against the plate with no edges turned up or away from the plateSee Figure 3-2143052