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Yesterday I was flushing my 75 hp Merc. with a hose adapter(like I have many times). I noticed the upper unit felt warm while running, not hot just warm. The peer was working just fine, and I didn't get an alarm. My question is, is that normal for an engine that size when being flushed on a hose? The reason I'm asking is that I flushed my 40 hp Johnson also and it didn't get warm at all. I've never had a problem with the Merc, just wanted some opinions. Thanks.

The Merc may be designed to run warmer, the thermostat determines the running temp. I wouldn't let it worry me none, so long as things are working properly

PROBABLY DOESN'T MEAN A THING. ALL 5 OF MY EVINRUDES RUN COOL EITHER ON THE RABBIT EARS OR IN THE GULF, NEVER HAVE HAD A HEAT PROBLEM WITH OMC PRODUCTS, OR FOR THAT MATTER, HAVENT HAD ANY PROBLEM ON ANY OF MY ENGINES. THE OLDEST IS 52 YEARS OLD AND STILL GOING STRONG.
PA THE OLD MAN