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  • thermastats

    84 175 hp 220aeto. Know where the thermo sensors are but wher are the thermastats located. Is there just one or is there more. I also want to know what the two wire sensor is on the head about mid way down. Wondering if it's a o2 sensor.

  • #2
    The two thermostats on my 115 Yamaha are located at the top of each head assy (V-4 block). They are under the thermo covers that are held on by four bolts. Yours should be the same on that V-6 block.
    Considering the age of your outboard, if you remove the thermo covers, the gaskets will probably tear - replace with new ones.
    Good luck,
    Ken K

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