The top RPM is listed in your owners manual but most of the latest 150's have a redline of 6000 rpm. For most applications with pontoon boats is to choose a prop that is as close to 6000 rpm as yoiu can get with a light load onboard.
This allows for adding a dozen passengers with gear and ice chests along with a full tank of gas to keep the engine in the recommended rpm band while heavily loaded.
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
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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.
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