03-02-2019 07:44 - edited 03-02-2019 07:45
To avoid any future problems, it is recommended that your dealer check over your motor. With a bit of low speed running, the plugs will normally be black looking. The "normal" looking plug could be from an injector running lean or intermittently. You do not want to chance it.
The CHECK ENGINE warning light will register a service code in the EMM (engine computer) memory and will give the tech a starting place to look.
"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.