Hey J,Just got boat want to order thermostats. How do you know if the motor is a 2.5l or a 3.0l, 2004 200hp. 0T973851
i had had a problem with one of my 200HP Optimax's a few years ago, in which the smart gauges were beeping and would nt let the engine throttle up. I was told that there is a sensor that is a part of the reserve oil container attached to the engine. When this sensor goes you have to replace the whole bottle. Well I did and my problem was solved.Thank you for the replies. I am not sure I do need them. Opti's are new to me one motor gets up to 130 plus at idle the other only gets up to like 96 at idle after six minutes. Not sure which one really needs it if either. Have not been able to run the boat to see what it is running at underway. Dealing with a oil problem first. When I crack the motor oil tank the oil does not over flow. I checked the fittings and made sure boat tank caps were tight. Going to blow out oil line tomorrow and change the little in line filter. If that don't work I will start on the air line coming from the crankcase.