Originally Posted by Turbodiesel
Yes without a doubt, More so on four stroke engines!!. I could show you all sorts of photos from engines that have not been flushed every now and then.
Do the 4 strokes have higher temp thermostats to allow higher running temps and better emissions?
Salt should only precipate out at about 65C or above.
Most two strokes run pretty cool when running at any speed with the thermostats only coming into play when running slowly to allow smooth idle on a 2 strike I believe.