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DT125R FORUM

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  4. Break in new cylinder

Break in new cylinder

Scheduled Pinned Locked Moved Engine
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  • CalumC Calum

    I always thought it was giving it too much chst before thr rings have bedded in causes glazing.

    Either way, get it runing and put some miles intonit before hammeringnit. That's my advice. Two strokes don't last forever so it's a moot point if it lasts +-1k miles. The main thing is getting that fueling spot on.

    declanD Offline
    declanD Offline
    declan
    wrote on last edited by
    #30

    @calum 20 minutes to bleed the cooling it only took mine a few seconds

    Irongamer727I 1 Reply Last reply
    0
    • O Offline
      O Offline
      oldman
      wrote on last edited by
      #31

      You should warm the engine thoroughly to make sure thermostat opens and gives full flow to water passages, otherwise pockets of air could remain

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      • declanD declan

        @calum 20 minutes to bleed the cooling it only took mine a few seconds

        Irongamer727I Offline
        Irongamer727I Offline
        Irongamer727
        wrote on last edited by
        #32

        @declan after 20 minutes there were still air left. But at that point I felt satisfied.

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        • CalumC Online
          CalumC Online
          Calum
          wrote on last edited by
          #33

          I don't think I've really actively bled the coolant system on any of my builds. Fire her up rad cap off, just top it up. Quick blip round the block top her up jobs a goodun

          Always Originate, Never Pirate!

          Irongamer727I declanD 3 Replies Last reply
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          • CalumC Calum

            I don't think I've really actively bled the coolant system on any of my builds. Fire her up rad cap off, just top it up. Quick blip round the block top her up jobs a goodun

            Irongamer727I Offline
            Irongamer727I Offline
            Irongamer727
            wrote on last edited by
            #34

            @calum works for some

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            • CalumC Calum

              I don't think I've really actively bled the coolant system on any of my builds. Fire her up rad cap off, just top it up. Quick blip round the block top her up jobs a goodun

              declanD Offline
              declanD Offline
              declan
              wrote on last edited by
              #35

              @calum well I took my cap off started the bike and after a little bit the coolant expanded and started overflowing so it only took me a few seconds maybe 30s tops

              Irongamer727I 1 Reply Last reply
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              • declanD declan

                @calum well I took my cap off started the bike and after a little bit the coolant expanded and started overflowing so it only took me a few seconds maybe 30s tops

                Irongamer727I Offline
                Irongamer727I Offline
                Irongamer727
                wrote on last edited by
                #36

                @declan ideally you want to warm it up to operating temperature with cap off. That way you know there won't be excessive amounts of air once you're out riding. My radiator started pissing out coolant through the overflow hose due to improper bleeding.

                declanD 1 Reply Last reply
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                • Irongamer727I Irongamer727

                  @declan ideally you want to warm it up to operating temperature with cap off. That way you know there won't be excessive amounts of air once you're out riding. My radiator started pissing out coolant through the overflow hose due to improper bleeding.

                  declanD Offline
                  declanD Offline
                  declan
                  wrote on last edited by
                  #37

                  @irongamer727 so I just let it spill out?im pretty sure I managed to get all the air out of mine

                  Irongamer727I 1 Reply Last reply
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                  • declanD declan

                    @irongamer727 so I just let it spill out?im pretty sure I managed to get all the air out of mine

                    Irongamer727I Offline
                    Irongamer727I Offline
                    Irongamer727
                    wrote on last edited by
                    #38

                    @declan lucky you! I'm only telling you what I experienced with my bike. 😉

                    1 Reply Last reply
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                    • CalumC Calum

                      I don't think I've really actively bled the coolant system on any of my builds. Fire her up rad cap off, just top it up. Quick blip round the block top her up jobs a goodun

                      Irongamer727I Offline
                      Irongamer727I Offline
                      Irongamer727
                      wrote on last edited by
                      #39

                      @calum you think it's possible to glaze the bore of a plated cylinder? (Nikasil)

                      CalumC 1 Reply Last reply
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                      • Irongamer727I Irongamer727

                        @calum you think it's possible to glaze the bore of a plated cylinder? (Nikasil)

                        CalumC Online
                        CalumC Online
                        Calum
                        wrote on last edited by
                        #40

                        @irongamer727 Yes

                        Always Originate, Never Pirate!

                        Irongamer727I 1 Reply Last reply
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                        • CalumC Calum

                          @irongamer727 Yes

                          Irongamer727I Offline
                          Irongamer727I Offline
                          Irongamer727
                          wrote on last edited by
                          #41

                          @calum got dammit. I just want to start the bike, listen to it, set the idle and bleed the coolant. I have had it running for roughly 20 minutes on idle before so now I'm thinking of waiting until the snow disappears and then start braking it in.

                          CalumC 1 Reply Last reply
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                          • Irongamer727I Irongamer727

                            @calum got dammit. I just want to start the bike, listen to it, set the idle and bleed the coolant. I have had it running for roughly 20 minutes on idle before so now I'm thinking of waiting until the snow disappears and then start braking it in.

                            CalumC Online
                            CalumC Online
                            Calum
                            wrote on last edited by
                            #42

                            @irongamer727 Don't worry so much about it. Just go out and ride it. It's not going to cause it any harm.

                            Glazing the bore is going to happen if you literally build a fresh engine, then take the engine to the max non stop for the next thousand miles. You're talking about shortening the life of a two stroke whose top end should be rebuilt every 10k anyhow. So it really makes no odds. Stop worry about it so much.

                            Always Originate, Never Pirate!

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                            • Irongamer727I Offline
                              Irongamer727I Offline
                              Irongamer727
                              wrote on last edited by
                              #43

                              In theory, would a new cylinder and piston be run in after non stop 500 km riding. (We're assuming the engine runs rich with plenty of oil and is ridden carefully) or would it need some cooling down at times?

                              declanD 1 Reply Last reply
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                              • Irongamer727I Irongamer727

                                In theory, would a new cylinder and piston be run in after non stop 500 km riding. (We're assuming the engine runs rich with plenty of oil and is ridden carefully) or would it need some cooling down at times?

                                declanD Offline
                                declanD Offline
                                declan
                                wrote on last edited by
                                #44

                                @irongamer727 providing you have done your heat cycles and that the ride in question isn’t it’s first ride then I see no reason why you shouldn’t be able to without letting it cool down

                                Irongamer727I 1 Reply Last reply
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                                • declanD declan

                                  @irongamer727 providing you have done your heat cycles and that the ride in question isn’t it’s first ride then I see no reason why you shouldn’t be able to without letting it cool down

                                  Irongamer727I Offline
                                  Irongamer727I Offline
                                  Irongamer727
                                  wrote on last edited by
                                  #45

                                  @declan I'm meaning the first ride. No heat cycles involved

                                  declanD 1 Reply Last reply
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                                  • Irongamer727I Irongamer727

                                    @declan I'm meaning the first ride. No heat cycles involved

                                    declanD Offline
                                    declanD Offline
                                    declan
                                    wrote on last edited by
                                    #46

                                    @irongamer727 then no I wouldn’t advise it

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                                    • J Offline
                                      J Offline
                                      Jens Eskildsen
                                      wrote on last edited by
                                      #47

                                      I've never seen anything scientific about heat cycling after a bore job, so I wouldnt worry about that one.

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                                      • Irongamer727I Offline
                                        Irongamer727I Offline
                                        Irongamer727
                                        wrote on last edited by
                                        #48

                                        Me neither. I'll probably try to start the brake in today. But my aim is to cover ~50km.

                                        1 Reply Last reply
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                                        • Irongamer727I Offline
                                          Irongamer727I Offline
                                          Irongamer727
                                          wrote on last edited by
                                          #49

                                          @Calum what's your opinion on a non stop 500km brake in? Would it work?

                                          CalumC declanD 2 Replies Last reply
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