It seems like the motors that are run the most are the ones that last the longest. And motors that are babied, and sit around a lot seem to have more problems per hour.
So you might as well run the motor! Just make sure you still flush it regularly, condition the fuel and use good oil.
Glad to hear Evinrude stood behind their product. I'm looking forward to getting mine installed on my tin boat soon.
To expand on your explanation, motorhomes have many of the same "calendar induced" problems because they may be driven a few times during a summer, then they sit unused for another year until the following summer.
In the general aviation world, a rarely flown aircraft is called a "hangar queen" and one suffers the same types of issues from sitting for long periods. The one saving grace is that the expensive aviation fuel is produced with storage additives to minimize problems from stale gas.
"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.