03-02-2012 07:32 - edited 03-02-2012 07:53
The correct prop allows the motor to turn in its upper half of the recommended rpm range, and that all depends on the boat and the load aboard. You will need a tachometer and perhaps several propellers to try out. Find a dealer who will work with you or who is familiar with your type of rig. Chances are you may have to increase the pitch by 2" to 4".
For the available props, click on ONLINE STORE at the top of this page, then ACCESSORIES, the PROPELLERS
Was your motor re-jetted for your high Denver altitude? If so, it will need the stock jetting put back in or the motor may run too lean at sea level and damage the pistons. Again, find a knowledgeable dealer.
"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.