I took my boat out today for the first time this season. I had the outdrive replaced under warrantee over the winter layup and was watching everything very carefully while putting her through some "sea trials". The one thing that I did not like was the engine temp. It seemed to be running hotter than last season and there were some 30 degree temp swings. Swings were from 170 to 200. Temp over all was averaging 180-185 instead of the solid 170-175 I saw last year. Keep in mind this is spring lake water in Maine... ie: make-your-feet-ache cold. Maybe the cold water is the difference. At summer lake water temps would you expect the thermostat to be full open? So with colder lake temps is the thermostat working and I have just never seen it before? What do you think?