1978 Johnson 55 HP Outboards Service Manual, Page 25Get this manual
fRemove float valve, float valve seat, and gasket assembly from carburetor body CLEANING, INSPECTION AND REPAIR
GENERAL INSTRUCTIONS Clean all parts, except float and float valve, in solvent and blow dryDO NOT dry parts with cloth as lint may cause trouble in the reassembled carburetorBe sure all particles of gaskets are removed from gasket surfacesFlush all passages in the carburetor body with solvent and remove any gummy deposits with OMC Accessory Engine CleanerCertain solvents will not remove this gum which accumulates particularly in the float chamber and on needle valvesFLOAT VALVE AND SEAT ASSEMBLY aInspect float and arm for wear or damageIf the float is damaged or worn, discard it and install newoneCheck float arm wear in the hinge pin and float valve contact areasReplace if necessarybInspect the inlet float valve for grooves, nicks, or scratchesIf any are found, replace float valve assemblySee Figure -14Gum or varnish on the float valve must be removed with OMC Accessory Engine CleanerDO NOT attempt to alter the shape of the valvecCheck the float valve seat with magnifying glass; if seat is nicked, scratched, or worn out-ofround, it will not give satisfactory serviceSee Figure 3-15The valve seat and valve are matched set; if either is worn, both parts must be replacedUse new gasket when reinstalling the valve seat