Originally Posted by Mollers
As for flushing immediatetly after use?
Let's not get too worked up. Ideally it's good practise. If it doesn't happen every time don't worry. It might reduce the life of an engine by 0.0001%. Poor maintainence will do a better job. Look around a marina or moorings and ask the question, how many of those outboards are flushed everytime after use? Especially those used commercially.
If you can't do it after everytrip then let the engine cool down whilst the boats still in the water. Then quickly start it up and run it for a minute. This will get cold saltwater in to the system that won't crystalize and clog up the waterways.
A tip recomended to me by a commercial boat owner who rarely flushes his engine through. Probably only once a year and never gets problems.
However I don't do it but would if I was leaving the boat in a Marina for a few days.