Does the tachometer read about 300 rpm while the motor is cranking over?
"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.
shoot me I forgot to look... Put it this way - I am good mechanically but terrible with things electric. If this is pointing to anything involving voltmeters and such I had best hand it over to a pro... Trying to locate one on the Vineyard now... Only savior might be if it was something like a sensor or switch that I could swap...