2007 135optimax overheating

[catfish361]

I have a 2007 135optimax and when I am running about 1000 to 1500rpm the motor starts to overheat. If I go faster or slower the temp. drops back to normal range. Is this a water impeller issue or something else?

 

[rtpassini]

Re: 2007 135optimax overheating

this is just my guess. but it sounds like an impellar issue

and geebus....a 2007 with problems? thats terrible...

 

[4Bassin]

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.

 

[hkeiner]

Re: 2007 135optimax overheating

The below troubleshooting guide may give you some ideas, even if you do not hook up a water pressure gauge.