1978 Evinrude Outboards 9.9/15HP Service Manual, Page 24Get this manual
CARBURETOR BODY aClean out all the jets and passages, and the venturi, making sure no gum or varnish deposits remainDry after cleaning with compressed airKeep clean for final reassemblybCheck all gasket surfaces for nicks, scratches, or distortionSlight irregularities can be corrected with the use of surface plate and emery clothcCheck throttle and choke shafts for excessive playCheck operation of choke and throttle valves to be sure they correctly shut off air flOW, yet move freely without bindingReplace carburetor if valves or shafts are excessively worn or damageddCheck hinge pin anchor holes; replace carburetor body if wornSAFETY WARNING STRIKING STEEL TOOL WITH STEEL HAMMER MAY PRODUCE CHIPS WHICH CAN CAUSE SERIOUS DAMAGE TO EY ESSAFETY GLASSES MUST BE WORN TO PREVENT INJURYCORE PLUGS aIf necessary, remove core plug to clean out slow speed orifice holesFigure 3-19Removing Core Plug cIf leakage persists, drill 18 inch (3 mm) hole through the center of the core plug to depth of not more than 116 inch (2 mm) below its surfaceWith punch, carefully pry out the core plugSee Figure 3-19dInspect and clean casting contact areaIf nicks, scratches, or an out-of-round condition exist, the casting will have to be replacedIf the casting opening is normal, apply bead of OMC Adhesive "M" to the outer edge of new core plugPlace the new core plug in the casting opening, convex side upFlatten to tight fit with flat end punch and hammerCheck for leakageLEAD SHOTS If leakage occurs at lead shot area follow these