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F9.9 4 Stroke

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  • F9.9 4 Stroke

    I hope someone can tell me the oil drain plug size on a 2017 4 stroke F9.9 Yamaha. I searched the previous threads and only find the listed size for the larger engines.
    The diameter and thread information would be very helpful. It would be an all-day project to take the boat out, drain the oil then take the plug to town in order to find the information. I did call the Yamaha dealer, but they couldn't help. They could order a replacement plug, but had no idea what size it was.
    Thanks
    Al

  • #2
    why do you need the info?

    most just suck the oil out instead of draining .
    it keeps people from messing up and cross threading it or pulling threads

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    • #3
      Tough question I guess.

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      • #4
        Not a tough question at all. Just something that 99.999% of Yamaha owners would not care about. I could be low on that percentage by the way.

        The part number may hold part of the answer.
        Last edited by boscoe99; 1 week ago.

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        • #5
          An older post from 2015 has the drain plug as 14MM

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          • #6
            Originally posted by boscoe99 View Post
            Not a tough question at all. Just something that 99.999% of Yamaha owners would not care about. I could be low on that percentage by the way.

            The part number may hold part of the answer.
            Thank you, I did guess from the part number that the size was 10mm, but I didn't know if it was a 1.0 or 1.5. Being an older person, I can look at a US bolt and tell the size and thread. Thanks again.

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            • #7
              Originally posted by robert graham View Post
              An older post from 2015 has the drain plug as 14MM
              Older F9.9's did use a 14mm plug. Later ones do not. Yam likes to keep us guessing.

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              • #8
                Originally posted by boscoe99 View Post

                Older F9.9's did use a 14mm plug. Later ones do not. Yam likes to keep us guessing.
                Guess the original poster's 2017 would make it a " later" model and a different drain plug?....guess Yamaha doesn't care about standardized predictability?

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