What kind of a boat are you running it on to adjust the high speed mix. Do not run it over 4,500RPM. Do not attempt to adjust the high speed in nutral. Correct adjustment can only be achieved after the motor is warmed up on a boat. Early breaker points were designed to "Float" at 5000 RPM to protect the motor. Serra Marine advertised a stronger spring to eliminate high speed miss. Evinrude issued a bulletin that motors failing with non OMC breaker points would not be covered by there warrantee. Later OMC points had slightly stronger springs. . . 😉
