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I just bought a 2019 mercury 90hp 4 stroke. I has been sitting for about a year. Was riding around then the alarm went off. I brought up my smartcraft app and had a overheat fault. So I watched the temp gauge. At idle would be around 120 degrees at 3000 rpm would hover around 150-160 degrees then when I get above 4000 rpm it would go to 175 degrees and then the alarm. Bring it down to idle and would go back 120 degrees. I'm going to change out the thermostat but I was wondering if this engine has a poppet valve. I can't find anything on it. Wondering if anybody else had this problem?
