When shifting from neutral to drive, E-Tec 50 has high RPM (2500) but slow boat speed unitl throttled up higher then reduces to normal RPM 800-1000, appreciate any thoughts
Sorry, but its hard to understand exactly what you are describing.
What is the engine model number?
Did this just start happening after something was done to the boat or motor or did it happen all of a sudden out of the blue?
Could you elaborate the sequence of events in more detail?
"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.