Originally the overheat alarm threshold was 194°F but in some conditions the temperature could spike momentarily and give a false alarm. The software updates changed the settings to 212° below 2000 rpm and If cylinder head temperature exceeds 195°F above 2000 RPM for 60 seconds, the
EMM would sound the warning and slow the motor to 1200 rpm.
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.