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    • J
      jonne123 last edited by

      Is it normal to have hole under my engine sized like small fingernail head. where the engine halfs meet?

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      • Calum
        Calum last edited by

        Yes that's normal

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        • J
          jonne123 last edited by

          Why it is there?

          Calum 1 Reply Last reply Reply Quote 0
          • Calum
            Calum @jonne123 last edited by

            @jonne123 Probably to help split the cases when you rebuild them. But I honestly wouldn't know.

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            • S
              SpookDog last edited by

              Sorry to rehash an old thread, but it’s a good question. It’s the first thing I wondered on when I first got my dt.
              It’s an air expansion hole. There is a sizeable enough air void inside that is opposite where the hot coolant goes to the water pump. If it was closed the air would expand, into the crank or outwards if the crankcase seal failed...
              I only worked it out when I split the cases...

              Stevie Wonder 1 Reply Last reply Reply Quote 1
              • Stevie Wonder
                Stevie Wonder @SpookDog last edited by

                @SpookDog said in Engine hole:

                Sorry to rehash an old thread, but it’s a good question. It’s the first thing I wondered on when I first got my dt.
                It’s an air expansion hole. There is a sizeable enough air void inside that is opposite where the hot coolant goes to the water pump. If it was closed the air would expand, into the crank or outwards if the crankcase seal failed...
                I only worked it out when I split the cases...

                I’m so glad someone else did this 😂
                The exact same thing happened to me, one week in of ownership, cleaning the bike and inspecting underneath and then boom. A little hole had appeared in my crankcase and I certainly hadn’t been doing any enduro, confused the absolute life out of

                declan 1 Reply Last reply Reply Quote 0
                • declan
                  declan @Stevie Wonder last edited by

                  @Stevie-Wonder same with me lol

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                  • Nottsbiker
                    Nottsbiker last edited by

                    Someone at Yamaha put it there for a laugh so people for years would ask whats this hole for? 😉

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