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DT125R FORUM

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  4. Tiny coolant leak.

Tiny coolant leak.

Scheduled Pinned Locked Moved Engine
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  • Glynn123G Glynn123

    Sounds like where my overflow hose goes to from the expansion bottle, is expansion bottle full? If not are hoses running to it loose?

    Sgt Robuck 5S Offline
    Sgt Robuck 5S Offline
    Sgt Robuck 5
    wrote on last edited by
    #3

    @glynn123 I'll have a check of the hoses. i've been topping it up so that it doesn't run low on coolant.

    Glynn123G 1 Reply Last reply
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    • Sgt Robuck 5S Sgt Robuck 5

      @glynn123 I'll have a check of the hoses. i've been topping it up so that it doesn't run low on coolant.

      Glynn123G Offline
      Glynn123G Offline
      Glynn123
      wrote on last edited by
      #4

      @sgt-robuck-5 likely just spitting it out since its overfilled, fill the radiator up but have the expansion bottle with just a bit in the bottom, one it's hot the level will rise and should sit between the markings

      Sgt Robuck 5S 1 Reply Last reply
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      • Glynn123G Glynn123

        @sgt-robuck-5 likely just spitting it out since its overfilled, fill the radiator up but have the expansion bottle with just a bit in the bottom, one it's hot the level will rise and should sit between the markings

        Sgt Robuck 5S Offline
        Sgt Robuck 5S Offline
        Sgt Robuck 5
        wrote on last edited by
        #5

        @glynn123 oh really? so me putting to much in could be the problem! makes sense i'll leave it for a little while and see how it goes

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        • Sgt Robuck 5S Offline
          Sgt Robuck 5S Offline
          Sgt Robuck 5
          wrote on last edited by
          #6

          As you can see it's all over the kickstand but it isn't wet on the upper levels of the frame...
I also removed the expansion tank side panel and it didn't seem to have any signs of water or dampness

          declanD 1 Reply Last reply
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          • Sgt Robuck 5S Sgt Robuck 5

            As you can see it's all over the kickstand but it isn't wet on the upper levels of the frame...
I also removed the expansion tank side panel and it didn't seem to have any signs of water or dampness

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

            @sgt-robuck-5 mine used to leak under the seat and that would easily run down the frame to the kickstand

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            • Sgt Robuck 5S Offline
              Sgt Robuck 5S Offline
              Sgt Robuck 5
              wrote on last edited by
              #8

              Found out for sure that it was the coolant overflow. Used a cooling system pressure tester and the overflow pipe on the expansion tank sends it through the frame and out the bottom towards the kickstand and further underneath the frame. Didn’t realise the coolant was dumped through the frame.

              Irongamer727I 1 Reply Last reply
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              • Sgt Robuck 5S Sgt Robuck 5

                Found out for sure that it was the coolant overflow. Used a cooling system pressure tester and the overflow pipe on the expansion tank sends it through the frame and out the bottom towards the kickstand and further underneath the frame. Didn’t realise the coolant was dumped through the frame.

                Irongamer727I Offline
                Irongamer727I Offline
                Irongamer727
                wrote on last edited by
                #9

                @sgt-robuck-5 someone has forgot to bleed the cooling system I see

                Sgt Robuck 5S 1 Reply Last reply
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                • Irongamer727I Irongamer727

                  @sgt-robuck-5 someone has forgot to bleed the cooling system I see

                  Sgt Robuck 5S Offline
                  Sgt Robuck 5S Offline
                  Sgt Robuck 5
                  wrote on last edited by
                  #10

                  @irongamer727 wouldn’t all the trapped air go out The expansion tank when the engine has been left running and then it would suck the coolant from the expansion tank in?

                  Irongamer727I 1 Reply Last reply
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                  • Glynn123G Offline
                    Glynn123G Offline
                    Glynn123
                    wrote on last edited by
                    #11

                    Mine seems to overflow out the left of the frame along side carb, as when the headgasket went a couple weeks ago it sprayed hot coolant all down my leg 😂

                    1 Reply Last reply
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                    • Sgt Robuck 5S Sgt Robuck 5

                      @irongamer727 wouldn’t all the trapped air go out The expansion tank when the engine has been left running and then it would suck the coolant from the expansion tank in?

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

                      @sgt-robuck-5 doesn't work like that. Air pushes coolant up in the expansion tank filling it and then spits out on the road. Then returns to normal once cool. Just open the radiator cap and bleed it, problem solved.

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