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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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  • 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
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    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
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    • 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
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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
        #8
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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
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          • 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
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            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
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            • 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!

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              • 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
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                • 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
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                  • 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
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                    • 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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