I have an overheating buzzer go off on my 135HP fuel Injected Honda outboard after about 10 minutes. I have replaced the water pump and an O2 sensor which I was told could be the problem. Water comes out of the pee hole very good and the thermostats have been replaced. I'm at a loss to figure out what to do next, Any thoughts would be helpful.

 

welcome to the forum. i am not a marine expert at all. just some basics on the overheating. clogged thermostat, water line, exhaust system heat exchanger, rubber corroded impeller, pressure control valve stuck open allowing water to drain out of exhaust without cooling the heads.

 

Thank you so much for your reply and your thoughts. This is the first Honda I've ever owned and I don't know a lot about the engine. I will certainly look into your suggestions.

 

i do hope you find what is causing the overheating. when you find it tell us what it was, if not come back and we'll look for more causes of the overheat.

 

I will let you know what I find and thanks again for your input.