Re: 1977 140 hp evinrude warm port side
There are two stats in the thermostat housing-each controls the temp for one side of the block. Likely the port stat is stuck shut. Also, when you have the stat housing apart, check the valve body. There are two very small pinholes in the middle which can clog up. Make sure they are both open, or it will overheat at idle when you reassemble it.
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