1968 Evinrude Big Twin, Big Twin Electric, Lark 40 HP Outboards Service Manual, Page 25Get this manual
MANIFOLD Check smaH hole manifold which feeds vacuum to cut-out switch hoseDO NOT enlarge hole; only clean outUse #76 drill to clean out holeCheck hose from manifold to cut-out switch for clogging, kinks, pin holes REASSEMBLV OF CARBURETOR
GENERAL INSTRUCTIONS Reassemble the carburetor, paying particular attention to the foHowing proceduredust, dirt, and lint out of the carburetor during reassemblysure that parts clean and free from gum, varnish, and corrosion when reassembling themReplace gaskets and ringsDO NOT attempt to use original gaskets and rings because leaks develop after the engine is back in useCheck the Torque Chart in Section for correct torque recommendations during reassemblyFLOAT AND FLOAT CHAMBER InstaH high-speed nozzle and new carburetor boss gasket in float Replace float valve seat and gasket, float valve, float, and hinge pinCheck for correct positioning of floatcarburetor body upside down so weight of float closes needleof float should even with rim of castingSee Figure 3-18Reassemble float using new gasketdReplace the high-speed plugto carburetor body, plug and screw