1995 merc 40 hp wont plane, 3400 rpm

boat ran great, then suddenly would not run over 4200rpm, down from @5200. barely plane. I eliminated fuel system fromexit of cowl, then all nee fuel lines and clamps to carbd. rebuilt carbs and fuelpump. good compression. new plugs, stator, switchbox. all grounds good. all connections good. starts, idles fine. last trip was down to 3400 rpm

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