I have a 2020 60HO. The flushing port has a black plastic cap/nut on it. This cap has a small 1/8" hole in it. What is the purpose of this cap if it has a hole in it? In order to flush the motor you must remove this cap and screw in a garden hose. The problem is you really need to first screw in a short piece of hose so that you can thread it into the port. This adds a an extra step. Is there any reason I couldn't replace the OEM cap/nut with a plastic quick connect? The hole in the quick connect is larger than the stock piece. Any down side to this?
What can get confusing is that with the earlier models, without the newer VSA, needed a 3/8" dia. opening to allow enough water flow through the fuel cooler (VSA) and the EMM. If the older ones were restricted, the EMM would overheat at heigher speeds.
"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.