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DT125R FORUM

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  2. General Discussion
  3. Ripping

Ripping

Scheduled Pinned Locked Moved General Discussion
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  • V Offline
    V Offline
    vtrn_raptor
    wrote on last edited by
    #3

    Just a new piston and rings and put it back on the servo as was pinned and has a full dep

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    • V Offline
      V Offline
      vtrn_raptor
      wrote on last edited by
      #4

      And thanks man need to open it up a bit and see if it pull properly

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      • CalumC Offline
        CalumC Offline
        Calum
        wrote on last edited by
        #5

        Did you not hone the bore?

        Always Originate, Never Pirate!

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        • V Offline
          V Offline
          vtrn_raptor
          wrote on last edited by
          #6

          No mate was I suppose to 🤣

          CalumC 1 Reply Last reply
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          • V vtrn_raptor

            No mate was I suppose to 🤣

            CalumC Offline
            CalumC Offline
            Calum
            wrote on last edited by
            #7

            @vtrn_raptor Depends whether the bore needed doing.

            If you didn't hone it or bore it and merely changed the rings, then 50 miles would suffice.

            You should be free to rip roar now mate.

            When you hone or rebore it I'd recommend 300 miles. 1000 on a fuel rebuild. But rings, 50 miles will suffice.

            Always Originate, Never Pirate!

            Irongamer727I 1 Reply Last reply
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            • Glynn123G Offline
              Glynn123G Offline
              Glynn123
              wrote on last edited by
              #8

              3 heat cycles, gentle hour odd ride, another couple rides varying the revs and then I just hammered mine, that was after a fresh bore, wossner piston at 0.2mm clearance as recommended. Bike still runs great and pulls strong. I've only done a total of about 150 miles on my DT since I done the engine, was probably hammering it at about 30-40 miles, but I mainly ride offroad so you dont rack up the miles on trails, the main thing to do in a break in is heat cycles, I know many people who do 3 heat cycles and then go for it but id rather be abit more careful.

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              • J Offline
                J Offline
                Jens Eskildsen
                wrote on last edited by
                #9

                Any source for the benefits of doing heat-cycles?
                Have seen it mentioned from time to time, but never seen anything to back it up.
                Thanks man 🙂

                CalumC 1 Reply Last reply
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                • J Jens Eskildsen

                  Any source for the benefits of doing heat-cycles?
                  Have seen it mentioned from time to time, but never seen anything to back it up.
                  Thanks man 🙂

                  CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by
                  #10

                  @jens-eskildsen I've seen it mentioned...on RC cars.

                  Always Originate, Never Pirate!

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                  • Glynn123G Offline
                    Glynn123G Offline
                    Glynn123
                    wrote on last edited by
                    #11

                    Heat cycles will help bed in the piston skirt gently, along with the rings id imagine, allows the piston to expand gently without being under any load, load is the worst thing possible on a fresh engine.

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                    • CalumC Calum

                      @vtrn_raptor Depends whether the bore needed doing.

                      If you didn't hone it or bore it and merely changed the rings, then 50 miles would suffice.

                      You should be free to rip roar now mate.

                      When you hone or rebore it I'd recommend 300 miles. 1000 on a fuel rebuild. But rings, 50 miles will suffice.

                      Irongamer727I Offline
                      Irongamer727I Offline
                      Irongamer727
                      wrote on last edited by
                      #12

                      @calum 1000 on a rebuild? That seems a bit much. Do you mean with new bearing and stuff?

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                      • ricky0115R Offline
                        ricky0115R Offline
                        ricky0115
                        wrote on last edited by
                        #13

                        How do motocross bikes go about running in their engines 200 miles on a track would take months 😂

                        CalumC 1 Reply Last reply
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                        • ricky0115R ricky0115

                          How do motocross bikes go about running in their engines 200 miles on a track would take months 😂

                          CalumC Offline
                          CalumC Offline
                          Calum
                          wrote on last edited by
                          #14

                          @ricky0115 MX aren't built to last mate. You can't compare a road going engine, to an engine that is only supposed to last 40 hours lol.

                          @Irongamer727 Yeah, on a full nut and bolt road going rebuild, crank, mains, gearbox, I would put a 1k miles into before I'd saying it's run it.

                          You may be misinterpreting the run in procedure for an engine. Which I am not going to describe, lots of conflicting information about that elsewhere, but it doesn't mean drive like your nan for 1k miles.

                          Always Originate, Never Pirate!

                          ricky0115R 1 Reply Last reply
                          1
                          • CalumC Calum

                            @ricky0115 MX aren't built to last mate. You can't compare a road going engine, to an engine that is only supposed to last 40 hours lol.

                            @Irongamer727 Yeah, on a full nut and bolt road going rebuild, crank, mains, gearbox, I would put a 1k miles into before I'd saying it's run it.

                            You may be misinterpreting the run in procedure for an engine. Which I am not going to describe, lots of conflicting information about that elsewhere, but it doesn't mean drive like your nan for 1k miles.

                            ricky0115R Offline
                            ricky0115R Offline
                            ricky0115
                            wrote on last edited by
                            #15

                            @calum ah explains it all 😂

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                            • J Offline
                              J Offline
                              Jens Eskildsen
                              wrote on last edited by
                              #16

                              MX bikes runs way bigger piston to cylinder tolerances last time I compared 🙂

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