Overheating Evinrude 120

[wetcoaster]

I have a new to me 1985 Evinrude 120. When running on muffs for about 5 minutes the starboard head is cool to the touch, but the port head is on the hot side. I pulled the thermostat and it seems to be okay. Any ideas why the port side head is running hot

Thanks

[t-bone]

Not an expert but I think i would check the starboard thermostat , it shouldn't be cool after 5 min. If you can hold a finger on the head for no more than three seconds, its about 140 degrees.

[wetcoaster]

Good point. If the starboard thermostat was stuck wide open would that also reduce water flow to the port cylinders, especially on muffs at a lower rpm