Choosing the correct propeller for your type of boating is normally a trial and error situation. It is best to work with your dealer to try out different propeller sizes and styles to find one that best suits your needs.
The following link is a performance report on a 2275 Bennington with a 250 HO which is a very strong motor. It found the 18" Viper to work well. Based on that I would start with a 16" or 17" Viper with your 225hp motor. For skiing and tubing, you might want to try a 15" Rebel for a strong midrange and economical cruising.
http://www.evinrude.com/Content/Pdf/neutral/performanceReports/PE761.pdf
With a pontoon boat is is advisable to prop it near the top rpm range to allow for additional people and gear aboard without lugging the motor. For your 225, somewhere in the 5600-5800 rpm range works well.
"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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