Hello, i have a mercury 96 xr6 150 that cant seem to figure out. Motor has new water pump kit. Thermostats that are newer and checked. Popet valve re sealed and new diaphragm.
Motor pumps water good. Does have quite a bit coming out exhaust ports aswell as pee hole. After running 10 mins at about 45 overheat alarm goes off. Turn it off and run 5 to 10 mins later samething alarm goes off still pumping good. Any ideas? Also did a compression test 135 on all 6 cylinders.