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DT125R FORUM

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  4. Temperature light, how does it work?

Temperature light, how does it work?

Scheduled Pinned Locked Moved Electrics
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  • B Offline
    B Offline
    bird902
    wrote on last edited by
    #1

    I'm replacing the stock speedo to a digital one, unfortunately I don't have temp light or gauge on my new one so I was wondering what is happening really inside stock speedometer, is it just a bulb or is there something more? I read somewhere here that it works based on resistance so my plan was maybe to wire it to a rpm gauge on my speedometer since I don't have an rpm gauge on my stock one and don't really care enough to make custom wiring for it so basically the rpm gauge will tell me the temperature, but I think that it is really reaching.
    Anyways, my main question is if I can just ignore it since I don't really push it that hard and actually never seen my temperature bulb turn on or to try to wire it on a small bulb that I will put somewhere on my bike, and if it is really just a bulb or maybe there is something else that is crucial to the cooling system (I am studying the wiring diagram and since Im not too good I don't know what some symbols mean like water temp.)

    B markus.wM S D 4 Replies Last reply
    0
    • B bird902

      I'm replacing the stock speedo to a digital one, unfortunately I don't have temp light or gauge on my new one so I was wondering what is happening really inside stock speedometer, is it just a bulb or is there something more? I read somewhere here that it works based on resistance so my plan was maybe to wire it to a rpm gauge on my speedometer since I don't have an rpm gauge on my stock one and don't really care enough to make custom wiring for it so basically the rpm gauge will tell me the temperature, but I think that it is really reaching.
      Anyways, my main question is if I can just ignore it since I don't really push it that hard and actually never seen my temperature bulb turn on or to try to wire it on a small bulb that I will put somewhere on my bike, and if it is really just a bulb or maybe there is something else that is crucial to the cooling system (I am studying the wiring diagram and since Im not too good I don't know what some symbols mean like water temp.)

      B Offline
      B Offline
      bird902
      wrote on last edited by
      #2

      WIRING DIAGRAM

      1 Reply Last reply
      0
      • B bird902

        I'm replacing the stock speedo to a digital one, unfortunately I don't have temp light or gauge on my new one so I was wondering what is happening really inside stock speedometer, is it just a bulb or is there something more? I read somewhere here that it works based on resistance so my plan was maybe to wire it to a rpm gauge on my speedometer since I don't have an rpm gauge on my stock one and don't really care enough to make custom wiring for it so basically the rpm gauge will tell me the temperature, but I think that it is really reaching.
        Anyways, my main question is if I can just ignore it since I don't really push it that hard and actually never seen my temperature bulb turn on or to try to wire it on a small bulb that I will put somewhere on my bike, and if it is really just a bulb or maybe there is something else that is crucial to the cooling system (I am studying the wiring diagram and since Im not too good I don't know what some symbols mean like water temp.)

        markus.wM Offline
        markus.wM Offline
        markus.w
        wrote on last edited by markus.w
        #3

        @bird902 the rev counter on the DT125r is mechanical, cable operated. You can get a radiator pressure cap with a built in temperature gauge. Just be sure to get one rated for the correct pressure which is 12.8 psi. Here's a link to one at 13 psi which I'm sure would be close enough. In fact they both also state 0.9 bar equivalent.
        https://www.ebay.co.uk/itm/283692838413?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=tPhH5CybRYK&sssrc=2349624&ssuid=7ztfcrwyt6w&var=&widget_ver=artemis&media=COPY

        B 2 Replies Last reply
        0
        • B bird902

          I'm replacing the stock speedo to a digital one, unfortunately I don't have temp light or gauge on my new one so I was wondering what is happening really inside stock speedometer, is it just a bulb or is there something more? I read somewhere here that it works based on resistance so my plan was maybe to wire it to a rpm gauge on my speedometer since I don't have an rpm gauge on my stock one and don't really care enough to make custom wiring for it so basically the rpm gauge will tell me the temperature, but I think that it is really reaching.
          Anyways, my main question is if I can just ignore it since I don't really push it that hard and actually never seen my temperature bulb turn on or to try to wire it on a small bulb that I will put somewhere on my bike, and if it is really just a bulb or maybe there is something else that is crucial to the cooling system (I am studying the wiring diagram and since Im not too good I don't know what some symbols mean like water temp.)

          S Offline
          S Offline
          SpookDog
          wrote on last edited by SpookDog
          #4

          @bird902

          I’m guessing that there is a small Curcuit board in the loom somewhere, unless the sensor in the head has a thermo-switch encorporated in it on the later gauge free models? To tell the bulb when to turn on…

          1 Reply Last reply
          0
          • B bird902

            I'm replacing the stock speedo to a digital one, unfortunately I don't have temp light or gauge on my new one so I was wondering what is happening really inside stock speedometer, is it just a bulb or is there something more? I read somewhere here that it works based on resistance so my plan was maybe to wire it to a rpm gauge on my speedometer since I don't have an rpm gauge on my stock one and don't really care enough to make custom wiring for it so basically the rpm gauge will tell me the temperature, but I think that it is really reaching.
            Anyways, my main question is if I can just ignore it since I don't really push it that hard and actually never seen my temperature bulb turn on or to try to wire it on a small bulb that I will put somewhere on my bike, and if it is really just a bulb or maybe there is something else that is crucial to the cooling system (I am studying the wiring diagram and since Im not too good I don't know what some symbols mean like water temp.)

            D Offline
            D Offline
            dan28
            wrote on last edited by
            #5

            @bird902 if your going to fit a digital speedo may aswel fit one that has temp gauge an tacho its good to keep an eye on whats going on inside your engine kosso make a nice digi speedo with temp gauge tavho an also built in warning lights

            1 Reply Last reply
            0
            • markus.wM markus.w

              @bird902 the rev counter on the DT125r is mechanical, cable operated. You can get a radiator pressure cap with a built in temperature gauge. Just be sure to get one rated for the correct pressure which is 12.8 psi. Here's a link to one at 13 psi which I'm sure would be close enough. In fact they both also state 0.9 bar equivalent.
              https://www.ebay.co.uk/itm/283692838413?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=tPhH5CybRYK&sssrc=2349624&ssuid=7ztfcrwyt6w&var=&widget_ver=artemis&media=COPY

              B Offline
              B Offline
              bird902
              wrote on last edited by
              #6

              @markus-w I heard of those failing, don't know if I can trust them but I guess it's my best option, just gotta check coolant regularty

              CalumC 1 Reply Last reply
              0
              • markus.wM markus.w

                @bird902 the rev counter on the DT125r is mechanical, cable operated. You can get a radiator pressure cap with a built in temperature gauge. Just be sure to get one rated for the correct pressure which is 12.8 psi. Here's a link to one at 13 psi which I'm sure would be close enough. In fact they both also state 0.9 bar equivalent.
                https://www.ebay.co.uk/itm/283692838413?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=tPhH5CybRYK&sssrc=2349624&ssuid=7ztfcrwyt6w&var=&widget_ver=artemis&media=COPY

                B Offline
                B Offline
                bird902
                wrote on last edited by
                #7

                @markus-w Also, the stock one is 1.1 bar so why 0.9 bar?

                markus.wM 2 Replies Last reply
                0
                • B bird902

                  @markus-w Also, the stock one is 1.1 bar so why 0.9 bar?

                  markus.wM Offline
                  markus.wM Offline
                  markus.w
                  wrote on last edited by
                  #8
                  This post is deleted!
                  1 Reply Last reply
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                  • B bird902

                    @markus-w Also, the stock one is 1.1 bar so why 0.9 bar?

                    markus.wM Offline
                    markus.wM Offline
                    markus.w
                    wrote on last edited by
                    #9

                    @bird902 to be honest bud I'm not familiar with bar. As I said they both state the same equivalent. As far as I'm aware the opening pressure is 12.8 psi. But I think you may be right about the quality of them. Not tried them myself but as Dan said digital ones are available.

                    HOTSHOT IIIH 1 Reply Last reply
                    1
                    • markus.wM markus.w

                      @bird902 to be honest bud I'm not familiar with bar. As I said they both state the same equivalent. As far as I'm aware the opening pressure is 12.8 psi. But I think you may be right about the quality of them. Not tried them myself but as Dan said digital ones are available.

                      HOTSHOT IIIH Offline
                      HOTSHOT IIIH Offline
                      HOTSHOT III
                      wrote on last edited by
                      #10

                      @markus-w 1 Bar = atmospheric pressure = 14.7psi, so (12.8/14.7)psi = 0.87 Bar

                      markus.wM 1 Reply Last reply
                      1
                      • B bird902

                        @markus-w I heard of those failing, don't know if I can trust them but I guess it's my best option, just gotta check coolant regularty

                        CalumC Offline
                        CalumC Offline
                        Calum
                        wrote on last edited by
                        #11

                        @bird902 I am currently running one of these. Seems pretty good so far. My speedo has packed up so it's a good way to get a basic idea of coolant temperature.

                        Always Originate, Never Pirate!

                        B 1 Reply Last reply
                        1
                        • HOTSHOT IIIH HOTSHOT III

                          @markus-w 1 Bar = atmospheric pressure = 14.7psi, so (12.8/14.7)psi = 0.87 Bar

                          markus.wM Offline
                          markus.wM Offline
                          markus.w
                          wrote on last edited by
                          #12

                          @HOTSHOT-III am I right in thinking that the opening pressure is 12.8 PSI? I got it from the Haynes manual but they have been known to make mistakes. Bird902 got me thinking now as he/she said it's 1.1 bar.

                          HOTSHOT IIIH 1 Reply Last reply
                          0
                          • markus.wM markus.w

                            @HOTSHOT-III am I right in thinking that the opening pressure is 12.8 PSI? I got it from the Haynes manual but they have been known to make mistakes. Bird902 got me thinking now as he/she said it's 1.1 bar.

                            HOTSHOT IIIH Offline
                            HOTSHOT IIIH Offline
                            HOTSHOT III
                            wrote on last edited by
                            #13

                            @markus-w Just looked in my '88 (round slide carb DTR) Yamaha service manual, they say 10.7-14.9psi. But both my '98 bikes have 1.1 (16.2psi) stamped on the rad cap, one of which I bought genuine by part number for that specific bike by VIN number to try before replacing the head gasket (it was losing 150ml of coolant every 90 miles when I bought the bike).

                            So it could be the case that Haynes took the figures from the '88 manual, stated 12.8psi as an average, then never bothered to update it as they've made similar inaccuracies with carbs and stuff. And there's a myriad of small differences like that between the '88 DTR and '89 onwards.

                            markus.wM 1 Reply Last reply
                            1
                            • HOTSHOT IIIH HOTSHOT III

                              @markus-w Just looked in my '88 (round slide carb DTR) Yamaha service manual, they say 10.7-14.9psi. But both my '98 bikes have 1.1 (16.2psi) stamped on the rad cap, one of which I bought genuine by part number for that specific bike by VIN number to try before replacing the head gasket (it was losing 150ml of coolant every 90 miles when I bought the bike).

                              So it could be the case that Haynes took the figures from the '88 manual, stated 12.8psi as an average, then never bothered to update it as they've made similar inaccuracies with carbs and stuff. And there's a myriad of small differences like that between the '88 DTR and '89 onwards.

                              markus.wM Offline
                              markus.wM Offline
                              markus.w
                              wrote on last edited by
                              #14

                              @HOTSHOT-III yes I've noticed a few mistakes. Thanks for clearing that up.

                              1 Reply Last reply
                              1
                              • CalumC Calum

                                @bird902 I am currently running one of these. Seems pretty good so far. My speedo has packed up so it's a good way to get a basic idea of coolant temperature.

                                B Offline
                                B Offline
                                bird902
                                wrote on last edited by
                                #15

                                @Calum what would be considered high temperature on one of those?

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