2011 Mercury Pro XS 250 1B841715. Motor went down (#6) Oct 2016, rebuilt and got back March 2017, with 50 hrs motor (#5) went down in July 2017, then rebuilt again. Since rebuilds, No matter the lake temp the motor will not exceed 91 degrees at idle and will not exceed 113 while running. 1-5 water pressure at idle and 20 -25 running WOT. I was recently in a new 250 pro xs and it went to 134 degrees at idle. Since rebuild it has not seen 115 degrees and only has maybe 20 hr on it currently. Any help appreciated.