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DT125R FORUM

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  3. Carburetor
  4. Carb overflow

Carb overflow

Scheduled Pinned Locked Moved Carburetor
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  • O Offline
    O Offline
    oldman
    wrote on last edited by
    #1

    Waiting for the decals for my 89 I thought I would ultrasonic clean the carb on my 125 dt mx (same as on the early dt125r's) came up well and checked float heights etc. Reassembled and petrol poured out of the overflow, stripped and checked multiple times and kept happening. Left bowl off and closed floats with finger and all fine??? Checked float bowl gasket was not causing any problem (replacement, slight difference, ) all fine. Filled float bowl with fuel and pouring out of overflow even when half full , examined overflow pipe in bowl and hairline crack along its length. Took photo but hard to see, not new or caused by ultrasonic bath I think, metal oxidized in crack. Assume it was gummed up and cleaning removed fuel gum, how unusual is that?? So beware if you come across same problem.0_1518193290091_20180209_161042-576x1024.jpg

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    • O Offline
      O Offline
      oldman
      wrote on last edited by
      #2

      This is the after picture, used acid flux to clean crack, then soldered with soldering iron and all seems ok, fingers crossed. Not the neatest job but dont want to disturb pipe in carb body.
      0_1518195645326_20180209_165426-576x1024.jpg

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      • J Offline
        J Offline
        Jens Eskildsen
        wrote on last edited by
        #3

        Theres just about only 2 things that can make it overflow.

        1. Floatheight. If its too high, the carb will overflow before the float makes the needlevalve shut of.
        2. Needle valve/seat. If one is worn, or the oring sealing the needleseat to the carb body is worn, fuel will still leak eventhough the float is adjusted properly.
        O 1 Reply Last reply
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        • J Jens Eskildsen

          Theres just about only 2 things that can make it overflow.

          1. Floatheight. If its too high, the carb will overflow before the float makes the needlevalve shut of.
          2. Needle valve/seat. If one is worn, or the oring sealing the needleseat to the carb body is worn, fuel will still leak eventhough the float is adjusted properly.
          O Offline
          O Offline
          oldman
          wrote on last edited by
          #4

          @jens-eskildsen said in Carb overflow:

          Theres just about only 2 things that can make it overflow.

          1. Floatheight. If its too high, the carb will overflow before the float makes the needlevalve shut of.
          2. Needle valve/seat. If one is worn, or the oring sealing the needleseat to the carb body is worn, fuel will still leak eventhough the float is adjusted properly.

          Or there is a split in the overflow pipe

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

            I was going to say can't it be repaired. But you reckon you got it fixed?

            Always Originate, Never Pirate!

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            • O Offline
              O Offline
              oldman
              wrote on last edited by
              #6

              All done, fitted back to bike and no more overflow. Just surprised as unexpected failure, not seen anything similar before, but you learn something new every day

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              • J Offline
                J Offline
                Jens Eskildsen
                wrote on last edited by
                #7

                Pics didnt load for me.
                Yeah, thats a very uncommon thing to happen, solder should work just fine.

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                • CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by
                  #8

                  Pictures are fine my end.

                  Always Originate, Never Pirate!

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