09-06-2010, 05:52 PM
i have a 1988 prostar 190 with a indmar 351. Runs great at normal operating speeds. when I really get on it and open it up it starts to get really hot 170 and climbing. I shut it down right away. Replaced the impellar and water pump as well as thermostat all at the begining of the year. I clean the cooler regularly. Any ideas???