Re: 2007 135optimax overheating
Do you have a water pressure gauge? If so what is the pressure at your overheat rpms? It seems odd that it cools below a certain rpm and cools above that rpm. I doubt it would be a impeller as it would get worse the lower the rpms are.
I would also confirm that the temp gauge and temp sending unit is functioning correctly before tearing into a water pump. Unless you have been starting the motor with the water pump out of water I would be skeptical that the water pump has any issues. Again, a quick way to tell would be to look at the telltale water stream when its running.
