1974 Johnson 40 HP Outboard Motors Service manual, Page 22Get this manual
blnspect the inlet needle valve for oovesnicksor scratchesIf any are foundreplace float valve assemblySee Figure 311 Gum or varnish Oil the needle valve must be removed with OMC Accessory Engine CleanerDO NOT attempt to aiter the shape of the needle valvecCheck the needle valve seat with magnifying glass; if seat is nicked, scratchedor worn out- ofround, it will not give satisfactory serviceSee Figu re 312The valve seat and needl are matched set; iI either is wornboth parts must be replacedUse new gasket when installing the needle seat 2l 0
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Figure 13Need le Valve Wear