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DT125R FORUM

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  4. So Close!...

So Close!...

Scheduled Pinned Locked Moved DTR
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  • S SpookDog

    Turns out it was heat seazures. 4 point seazure marks on piston, 1 bad enough to have ‘the look’ of sliding metal. More eating away of the piston crown and scoring to the barrel 🤨 it all happened before I changed the radiator. Oh well! We live and turn 🤪

    D Offline
    D Offline
    DTR+NSR
    wrote on last edited by
    #78

    @spookdog heat seizure is all to do with your mixture being to lean, nothing to do with how well your cooling is working or not. A lean mixture will burn hotter aswell. Which was probably contributing to your over heating.

    1 Reply Last reply
    0
    • CalumC Offline
      CalumC Offline
      Calum
      wrote on last edited by
      #79

      Oh bummer, what's the damage

      Always Originate, Never Pirate!

      S 1 Reply Last reply
      0
      • CalumC Calum

        Oh bummer, what's the damage

        S Offline
        S Offline
        SpookDog
        wrote on last edited by SpookDog
        #80

        @calum
        Pics to come when I fix phone!

        Has anyone had dealings with Athena gaskets that are 3 layers fixed together with 2 brass rivets?...

        alt text

        Anyone? The outer 2 are black with the usual coating, while the centre 1 is silver...

        @Dtr&nsr
        It’s definitely heat caused, mostly my own ignorance
        I understand that mixture being lean can run too hot, but it wasn’t solely that. There was even plenty of oil in the barrel and around the crank. Although it is a bit sooty and scorched!...

        @Everyone
        I have problems with my temp gauge, normal running temp is showing at 5mm above the C (for Cold) and any variation above doesn’t really show very much. It was below the halfway mark when the head gasket blew!!
        The old radiator was a lot less efficient at dumping heat than the new one, it was OK when the ambient temp was not ‘heatwave hot’. The new one throws away BTU’s nicely.
        Ideally I’d like to adjust the temp gauge with a resistor or something, so as that ‘normal’ temp is in the middle of the gauge...

        D 1 Reply Last reply
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        • S SpookDog

          @calum
          Pics to come when I fix phone!

          Has anyone had dealings with Athena gaskets that are 3 layers fixed together with 2 brass rivets?...

          alt text

          Anyone? The outer 2 are black with the usual coating, while the centre 1 is silver...

          @Dtr&nsr
          It’s definitely heat caused, mostly my own ignorance
          I understand that mixture being lean can run too hot, but it wasn’t solely that. There was even plenty of oil in the barrel and around the crank. Although it is a bit sooty and scorched!...

          @Everyone
          I have problems with my temp gauge, normal running temp is showing at 5mm above the C (for Cold) and any variation above doesn’t really show very much. It was below the halfway mark when the head gasket blew!!
          The old radiator was a lot less efficient at dumping heat than the new one, it was OK when the ambient temp was not ‘heatwave hot’. The new one throws away BTU’s nicely.
          Ideally I’d like to adjust the temp gauge with a resistor or something, so as that ‘normal’ temp is in the middle of the gauge...

          D Offline
          D Offline
          DTR+NSR
          wrote on last edited by
          #81

          @spookdog @spookdog a heat seizure is caused by the piston expanding to much/fast. From a lean mixture burning to hot. The piston basically becomes to big for the bore it's running in, and seizes. The fuel in a richer mixture actually takes heat from the piston crown. Lean mixture is backed up by the detonation you've seen on your piston.

          S 1 Reply Last reply
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          • D DTR+NSR

            @spookdog @spookdog a heat seizure is caused by the piston expanding to much/fast. From a lean mixture burning to hot. The piston basically becomes to big for the bore it's running in, and seizes. The fuel in a richer mixture actually takes heat from the piston crown. Lean mixture is backed up by the detonation you've seen on your piston.

            S Offline
            S Offline
            SpookDog
            wrote on last edited by
            #82

            @dtr-nsr
            It’s a cause, but not the reason in my case...

            S 1 Reply Last reply
            0
            • S SpookDog

              @dtr-nsr
              It’s a cause, but not the reason in my case...

              S Offline
              S Offline
              SpookDog
              wrote on last edited by SpookDog
              #83

              No one used this kinda gasket?
              Given my experiences recently I’m wary of fitting it even though it’s new & Athena...

              CalumC 1 Reply Last reply
              0
              • S SpookDog

                No one used this kinda gasket?
                Given my experiences recently I’m wary of fitting it even though it’s new & Athena...

                CalumC Offline
                CalumC Offline
                Calum
                wrote on last edited by
                #84

                @spookdog I always use Athena gaskets. RS/Cagiva/Yamaha

                Always Originate, Never Pirate!

                S 1 Reply Last reply
                0
                • CalumC Calum

                  @spookdog I always use Athena gaskets. RS/Cagiva/Yamaha

                  S Offline
                  S Offline
                  SpookDog
                  wrote on last edited by SpookDog
                  #85

                  Took me a while but I got a rebore and new piston. Almost got it back together.
                  I ended up getting another gasket, single layer usual thing. I just didn’t trust the triple ply one held together with brass rivets! A single bit of crap between one of the layers would be fatal. Theyre fairly loose but uncleanable on the 4 inner surfaces!...
                  I’d love to know why Athena makes it...

                  CalumC declanD 2 Replies Last reply
                  1
                  • S SpookDog

                    Took me a while but I got a rebore and new piston. Almost got it back together.
                    I ended up getting another gasket, single layer usual thing. I just didn’t trust the triple ply one held together with brass rivets! A single bit of crap between one of the layers would be fatal. Theyre fairly loose but uncleanable on the 4 inner surfaces!...
                    I’d love to know why Athena makes it...

                    CalumC Offline
                    CalumC Offline
                    Calum
                    wrote on last edited by
                    #86

                    @spookdog Never had an issue with Athena gaskets myself.

                    Always Originate, Never Pirate!

                    1 Reply Last reply
                    0
                    • S SpookDog

                      Took me a while but I got a rebore and new piston. Almost got it back together.
                      I ended up getting another gasket, single layer usual thing. I just didn’t trust the triple ply one held together with brass rivets! A single bit of crap between one of the layers would be fatal. Theyre fairly loose but uncleanable on the 4 inner surfaces!...
                      I’d love to know why Athena makes it...

                      declanD Offline
                      declanD Offline
                      declan
                      wrote on last edited by declan
                      #87

                      @spookdog I think you are overthinking the headgasket a bit mate athena make some of the best non oem gaskets and seals

                      S 1 Reply Last reply
                      0
                      • declanD declan

                        @spookdog I think you are overthinking the headgasket a bit mate athena make some of the best non oem gaskets and seals

                        S Offline
                        S Offline
                        SpookDog
                        wrote on last edited by
                        #88

                        @
                        I know they make good gaskets, but this thing is over 3 times the thickness of a ‘normal’ one. I’d just like to know why. There must be a good reason!...

                        Also my bike is ticking over nice and low but when I put the lights on it stumbles and dies. Any input? I have the first stator with three individual coils. 1 for charching 1 for lights and 1 for ignition. How can the lights be piggy backing the ignition?! Poor earth on the ignition side?

                        declanD CalumC 2 Replies Last reply
                        0
                        • S SpookDog

                          @
                          I know they make good gaskets, but this thing is over 3 times the thickness of a ‘normal’ one. I’d just like to know why. There must be a good reason!...

                          Also my bike is ticking over nice and low but when I put the lights on it stumbles and dies. Any input? I have the first stator with three individual coils. 1 for charching 1 for lights and 1 for ignition. How can the lights be piggy backing the ignition?! Poor earth on the ignition side?

                          declanD Offline
                          declanD Offline
                          declan
                          wrote on last edited by
                          #89

                          @spookdog id imagine it's a crush gasket so when it's torqued down it would crush down to oem thickness and seal really well

                          1 Reply Last reply
                          0
                          • S SpookDog

                            @
                            I know they make good gaskets, but this thing is over 3 times the thickness of a ‘normal’ one. I’d just like to know why. There must be a good reason!...

                            Also my bike is ticking over nice and low but when I put the lights on it stumbles and dies. Any input? I have the first stator with three individual coils. 1 for charching 1 for lights and 1 for ignition. How can the lights be piggy backing the ignition?! Poor earth on the ignition side?

                            CalumC Offline
                            CalumC Offline
                            Calum
                            wrote on last edited by
                            #90

                            @spookdog Same thing happens in my Starlet. If I turn the headlights on and fans on the idle drops 🤣

                            Always Originate, Never Pirate!

                            S 1 Reply Last reply
                            0
                            • CalumC Calum

                              @spookdog Same thing happens in my Starlet. If I turn the headlights on and fans on the idle drops 🤣

                              S Offline
                              S Offline
                              SpookDog
                              wrote on last edited by
                              #91

                              Done my first running in run. 65 miles of ‘still going’!
                              Fingers crossed 🤞

                              S 1 Reply Last reply
                              1
                              • S SpookDog

                                Done my first running in run. 65 miles of ‘still going’!
                                Fingers crossed 🤞

                                S Offline
                                S Offline
                                SpookDog
                                wrote on last edited by
                                #92

                                @spookdog

                                500 miles run in

                                S 1 Reply Last reply
                                2
                                • declanD Offline
                                  declanD Offline
                                  declan
                                  wrote on last edited by
                                  #93

                                  @spookdog noice

                                  1 Reply Last reply
                                  0
                                  • S SpookDog

                                    @spookdog

                                    500 miles run in

                                    S Offline
                                    S Offline
                                    SpookDog
                                    wrote on last edited by SpookDog
                                    #94

                                    @spookdog

                                    I just got a 400 Kenda rear tyre. Am I going to regret it? Does the Dtr take a 400 tyre ok?

                                    S 1 Reply Last reply
                                    0
                                    • S SpookDog

                                      @spookdog

                                      I just got a 400 Kenda rear tyre. Am I going to regret it? Does the Dtr take a 400 tyre ok?

                                      S Offline
                                      S Offline
                                      SpookDog
                                      wrote on last edited by
                                      #95

                                      Anyone used rust converter on exhaust downpipe?...

                                      R NottsbikerN Stevie WonderS markus.wM 4 Replies Last reply
                                      0
                                      • S SpookDog

                                        Anyone used rust converter on exhaust downpipe?...

                                        R Offline
                                        R Offline
                                        rollzy101
                                        wrote on last edited by
                                        #96

                                        @spookdog if its rust converter mine burnt and pealed off, ended up using acid based rust remover which was fine

                                        Owned: Yamaha DT125LC, XT125, DT125R, YZF R125, CBR125, RS125

                                        1 Reply Last reply
                                        0
                                        • S SpookDog

                                          Anyone used rust converter on exhaust downpipe?...

                                          NottsbikerN Offline
                                          NottsbikerN Offline
                                          Nottsbiker
                                          wrote on last edited by
                                          #97

                                          @spookdog I've used the Loctite stuff before but its not very good, apparently Jennolite (sp?) is meant to be much better. Probably better to get blasted then paint immediately afterwards

                                          1 Reply Last reply
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