1971 Johnson 2HP outboards Service Manual, Page 22Get this manual
3-7 LEAF VALVES aThe importance of keeping the leaves in these valves free from distortion cannot be over-emphasizedReplace any leaf or leaf back-up plate which shows any indication of distortion or damagebThe leaf is so designed that it maintains constant contact with the leaf plate until predetermined pressure is exerted against itLeaf travel away from the plate is limited to 14" by the leaf back-up plateWhen pressure is removed, the inherent spring action of the leaf segments returns and holds them against the plateAttach the leaf segments and leaf stops to the leaf plate, aligning leaves with marks on plateSee Figure 3-10cExamine each leaf carefullyEach leaf must lie flat against the plate with no edges turned up or away from the plateNOTE DO NOT lift or bend leaf segments by handThis may damage them so that the leaves would have to be replaceddTighten screws to torque specified in Section to avoid distortion of the leaf plate REASSEMBLY OF CARBURETOR AND LEAF VALVES TO MOTOR
aPlace new gasket between the intake manifold and crankcase, and attach to crankcasebUSing new gasket, place carburetor in position on manifold studs and fasten in place with nutscReconnect fuel line to carburetor