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DT125R FORUM

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  4. Makita Piston

Makita Piston

Scheduled Pinned Locked Moved Engine
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  • S Offline
    S Offline
    SpookDog
    wrote on last edited by
    #9

    Soooo, it’s an expander ring, for bores that have a bit too much clearance. Goes behind the thinner ring, on the bottom of the piston. Not recommended to be fitted if you have a nice tight fresh bore...
    Got an email from PJME

    declanD 1 Reply Last reply
    0
    • S SpookDog

      Soooo, it’s an expander ring, for bores that have a bit too much clearance. Goes behind the thinner ring, on the bottom of the piston. Not recommended to be fitted if you have a nice tight fresh bore...
      Got an email from PJME

      declanD Offline
      declanD Offline
      declan
      wrote on last edited by
      #10

      @SpookDog moar compression!! Will do 109 in 4th gear with that in then

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      • S Offline
        S Offline
        SpookDog
        wrote on last edited by
        #11

        @declan
        Wow, I wish I lived in the same reality as you...
        I think 🤔

        declanD 1 Reply Last reply
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        • CalumC Offline
          CalumC Offline
          Calum
          wrote on last edited by Calum
          #12

          I mean, typically that's how it goes. The higher the compression the more power. Typically.... You need fueling and ignition timing to accommodate.

          Always Originate, Never Pirate!

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          • S SpookDog

            @declan
            Wow, I wish I lived in the same reality as you...
            I think 🤔

            declanD Offline
            declanD Offline
            declan
            wrote on last edited by
            #13

            @SpookDog 👌

            D 1 Reply Last reply
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            • declanD declan

              @SpookDog 👌

              D Offline
              D Offline
              DTR+NSR
              wrote on last edited by
              #14

              When my dt was running 225psi it had incredible midrange but wouldn't rev high.

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              • CalumC Offline
                CalumC Offline
                Calum
                wrote on last edited by
                #15

                225PSI! Wow! That's mental.

                Always Originate, Never Pirate!

                D 1 Reply Last reply
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                • CalumC Calum

                  225PSI! Wow! That's mental.

                  D Offline
                  D Offline
                  DTR+NSR
                  wrote on last edited by
                  #16

                  @Calum that was a cold engine aswell! That's with +1mm over bore. Running a mick abbey modded head. Which is quite a few cc's less volume than stock 3mb.
                  Runing two base gaskets and a spacer plate now. To lower the compression which has also raised the port timing. I miss the heaps of midrange but not the bruised foot from kickstarting it lol.

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                  • CalumC Offline
                    CalumC Offline
                    Calum
                    wrote on last edited by
                    #17

                    Yeah I bet 🤣

                    Always Originate, Never Pirate!

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                    • S Offline
                      S Offline
                      SpookDog
                      wrote on last edited by
                      #18

                      @declan
                      Sorry, didn’t mean to offend. Plus I gave 👃👌 up a looooong time ago! 🙂

                      In all seriousness, I’d like to know what the cc of a 3MB head is? Mine had to be reprofiled to get rid of piston ring explosion marks and I’m not sure if it was skimmed to the point that it kept the same compression ratio

                      D 1 Reply Last reply
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                      • S SpookDog

                        @declan
                        Sorry, didn’t mean to offend. Plus I gave 👃👌 up a looooong time ago! 🙂

                        In all seriousness, I’d like to know what the cc of a 3MB head is? Mine had to be reprofiled to get rid of piston ring explosion marks and I’m not sure if it was skimmed to the point that it kept the same compression ratio

                        D Offline
                        D Offline
                        DTR+NSR
                        wrote on last edited by
                        #19

                        @SpookDog I measured one of my heads at 13cc, unfortunately can't remember which. The dome of the +1mm mitaka piston measures at 3.5cc though : p

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                        • S Offline
                          S Offline
                          SpookDog
                          wrote on last edited by
                          #20

                          Cheers bud, that’s something to work with. I’ve got a good 3bn, my reworked 3mb and another 3mb (that I forgot about till now) that is battle~scarred but otherwise original.

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