My alarm went off again yesterday. I have a new water pump (complete kit), a new thermostat and have flushed water through the whole system. Worked fine until yesterday. I can go full throttle to get the boat (16' al. Starcraft) to plane and throttle back to 3/4 throttle and it will go all day...
I have a 1989 70 hp Johnson that has a strange overheating problem. My alarm went off and after investigation etc. I replaced the water pump. (complete kit) Yesterday I went 4 miles down the lake at 3/4 throttle with no problem. When I increased to full throttle, the alarm went off. (after about...