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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 SpookDog

    Yeah. Mitaka. I called it something entirely different in the thread title and edited it to Makita. How embarrassing?!!

    The barrel and piston have just come back from PJME so I trust the tolerance, ect. The barrel is a 3MB and it says TZR on the piston box. Iโ€™ve never had one like this before but I have seen them online in pics, ect.
    The piston that was in before was a wossner. Both the rings looked identical, so I donโ€™t really know what to make of it all. Just want to get it right, what with being the sixteenth โ€˜registeredโ€™ owner. I feel I have a duty of care for the old plodder ๐Ÿ˜‡

    declanD Offline
    declanD Offline
    declan
    wrote on last edited by
    #7

    @SpookDog ive installed one and left one out canโ€™t remember which bikes but the dt probably has one and Iโ€™m sure I tried one with and without on an am6 engine and it appeared to make no difference I donโ€™t actually know what itโ€™s for most people donโ€™t install them.

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    • D DTR+NSR

      @Arild 0.30 - 0.45mm you'll want a decent small file. And only file inwards towards the centre of the ring. I hold the file in a vice and slide the ring along the jaws of the vice to help keep it all square as well.

      A Offline
      A Offline
      Arild
      wrote on last edited by
      #8

      @DTR-NSR

      Thanks mate๐Ÿ‘

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      • S Offline
        S Offline
        SpookDog
        wrote on last edited by
        #9

        Soooo, itโ€™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
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        • S SpookDog

          Soooo, itโ€™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 ๐Ÿค”

            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 ๐Ÿค”

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

                @SpookDog ๐Ÿ‘Œ

                D 1 Reply Last reply
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                • declanD declan

                  @SpookDog ๐Ÿ‘Œ

                  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 ๐Ÿคฃ

                        Always Originate, Never Pirate!

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

                          @declan
                          Sorry, didnโ€™t mean to offend. Plus I gave ๐Ÿ‘ƒ๐Ÿ‘Œ up a looooong time ago! ๐Ÿ™‚

                          In all seriousness, Iโ€™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 Iโ€™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, didnโ€™t mean to offend. Plus I gave ๐Ÿ‘ƒ๐Ÿ‘Œ up a looooong time ago! ๐Ÿ™‚

                            In all seriousness, Iโ€™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 Iโ€™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, thatโ€™s something to work with. Iโ€™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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