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DT125R FORUM

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  4. Dt enjoys the cold

Dt enjoys the cold

Scheduled Pinned Locked Moved Engine
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  • CalumC Calum

    Cold air is more desne, more O2 molecules to marry up with the atomised fuel.

    Better fuel mix equals better bang. You can expect your DT to continue increasing in performance as the days get colder...

    I remember how much of a difference the cold night made to my Aprilia when I was a wee lad.

    Irongamer727I Offline
    Irongamer727I Offline
    Irongamer727
    wrote on last edited by
    #4

    @calum so the air in the fuel/air mix is raised. Or the opposite?

    CalumC 1 Reply Last reply
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    • Irongamer727I Irongamer727

      @calum so the air in the fuel/air mix is raised. Or the opposite?

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

      @irongamer727 The fuel mixture is kept the same, the air mixture is richened.

      By the sounds of it, your bike is overfueling for 90% of riding.

      It should be a noticeable increase in power, but there shouldn't be any adverse affects during the day. It should just be noticeably quicker in the evenings when the air is colder, and therefore denser.

      Always Originate, Never Pirate!

      Irongamer727I 1 Reply Last reply
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      • CalumC Calum

        @irongamer727 The fuel mixture is kept the same, the air mixture is richened.

        By the sounds of it, your bike is overfueling for 90% of riding.

        It should be a noticeable increase in power, but there shouldn't be any adverse affects during the day. It should just be noticeably quicker in the evenings when the air is colder, and therefore denser.

        Irongamer727I Offline
        Irongamer727I Offline
        Irongamer727
        wrote on last edited by
        #6
        This post is deleted!
        CalumC 1 Reply Last reply
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        • Irongamer727I Irongamer727

          This post is deleted!

          CalumC Offline
          CalumC Offline
          Calum
          wrote on last edited by
          #7

          @irongamer727 Two strokes are really fussy. The more you turn them, the fussier they get.

          In stock trim, it shouldn't be necessary to alter the jet settings.

          Cars Imported from Japan, instantly need a remap in the UK. Whilst the climates are similar, Japan actually use much better fuel than we do, and hence the Motor Octane Rating in Japan is higher, and therefore cars imported from there don't run properly over here.

          It can be that senstiive

          Always Originate, Never Pirate!

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          • F Offline
            F Offline
            finnerz89
            wrote on last edited by
            #8

            Used to love cold damp mornings when I commuted on mine!

            Current bikes:
            DT125X '07
            Street Triple R '11
            Aprilia ETV1000 '02

            Previous:
            DR650RSE '96
            FJ1200 '92

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            • A Offline
              A Offline
              alex_dt
              wrote on last edited by
              #9

              use liquid nitrogen cooling inside the airbox (old pc's overclocking kit)

              so you dont have to wait for the evening. or winter. to have a cool ride.

              but what about misty / foggy days? with a lot of water molecules in the air ? That's even better for the combustion.

              Irongamer727I 1 Reply Last reply
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              • A alex_dt

                use liquid nitrogen cooling inside the airbox (old pc's overclocking kit)

                so you dont have to wait for the evening. or winter. to have a cool ride.

                but what about misty / foggy days? with a lot of water molecules in the air ? That's even better for the combustion.

                Irongamer727I Offline
                Irongamer727I Offline
                Irongamer727
                wrote on last edited by
                #10

                @alex_dt or just adjust the carb๐Ÿ˜‰

                declanD 1 Reply Last reply
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                • Irongamer727I Irongamer727

                  @alex_dt or just adjust the carb๐Ÿ˜‰

                  declanD Offline
                  declanD Offline
                  declan
                  wrote on last edited by
                  #11

                  @irongamer727 I find that taking the carb off completely improves performance dramatically

                  CalumC 1 Reply Last reply
                  1
                  • declanD declan

                    @irongamer727 I find that taking the carb off completely improves performance dramatically

                    CalumC Offline
                    CalumC Offline
                    Calum
                    wrote on last edited by
                    #12

                    @declan Yeah but when you are pushing yours, any weight you can remove is going to make it better. For those of use whose DT's aren't broke, best keep the carb on.

                    Always Originate, Never Pirate!

                    declanD 1 Reply Last reply
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                    • CalumC Calum

                      @declan Yeah but when you are pushing yours, any weight you can remove is going to make it better. For those of use whose DT's aren't broke, best keep the carb on.

                      declanD Offline
                      declanD Offline
                      declan
                      wrote on last edited by
                      #13

                      @calum ๐Ÿ˜‚๐Ÿ˜‚ actually quite depressed now๐Ÿ˜’

                      CalumC 1 Reply Last reply
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                      • declanD declan

                        @calum ๐Ÿ˜‚๐Ÿ˜‚ actually quite depressed now๐Ÿ˜’

                        CalumC Offline
                        CalumC Offline
                        Calum
                        wrote on last edited by
                        #14

                        @declan Well that ain't going to solve anything. Just fix it.

                        Always Originate, Never Pirate!

                        1 Reply Last reply
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                        • Irongamer727I Offline
                          Irongamer727I Offline
                          Irongamer727
                          wrote on last edited by
                          #15

                          Sorry but what are you talking about? Taking off the carb? Broken dts?(how could that happen๐Ÿ˜‰)

                          declanD 1 Reply Last reply
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                          • Irongamer727I Irongamer727

                            Sorry but what are you talking about? Taking off the carb? Broken dts?(how could that happen๐Ÿ˜‰)

                            declanD Offline
                            declanD Offline
                            declan
                            wrote on last edited by
                            #16

                            @irongamer727 Iโ€™m just fucking around since my dt has been playing up and @Calum expecting my reeds any day now

                            Irongamer727I 1 Reply Last reply
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                            • declanD declan

                              @irongamer727 Iโ€™m just fucking around since my dt has been playing up and @Calum expecting my reeds any day now

                              Irongamer727I Offline
                              Irongamer727I Offline
                              Irongamer727
                              wrote on last edited by
                              #17

                              @declan he's expecting your bike to go bang?

                              declanD 1 Reply Last reply
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                              • Irongamer727I Irongamer727

                                @declan he's expecting your bike to go bang?

                                declanD Offline
                                declanD Offline
                                declan
                                wrote on last edited by
                                #18

                                @irongamer727 no what happened was I took the bike out really late and a few mile way from home it broke down the Rev cable had came loose from the slide in the carb so I had no throttle and had to push it back and my reeds are bad so Iโ€™m waiting for my new ones then I can put it back together

                                CalumC 1 Reply Last reply
                                0
                                • declanD declan

                                  @irongamer727 no what happened was I took the bike out really late and a few mile way from home it broke down the Rev cable had came loose from the slide in the carb so I had no throttle and had to push it back and my reeds are bad so Iโ€™m waiting for my new ones then I can put it back together

                                  CalumC Offline
                                  CalumC Offline
                                  Calum
                                  wrote on last edited by
                                  #19

                                  @declan Happens to the best of us.

                                  I remember it happened when I fitted my belgarda engine. Sod pushing it home though, I just turned the idle screw up and rode it home in first lol.

                                  Always Originate, Never Pirate!

                                  declanD 1 Reply Last reply
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                                  • CalumC Calum

                                    @declan Happens to the best of us.

                                    I remember it happened when I fitted my belgarda engine. Sod pushing it home though, I just turned the idle screw up and rode it home in first lol.

                                    declanD Offline
                                    declanD Offline
                                    declan
                                    wrote on last edited by
                                    #20

                                    @calum I was thinking of that but couldnโ€™t turn it I tried using a bottle top I didnโ€™t have my tools lol

                                    CalumC 1 Reply Last reply
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                                    • declanD declan

                                      @calum I was thinking of that but couldnโ€™t turn it I tried using a bottle top I didnโ€™t have my tools lol

                                      CalumC Offline
                                      CalumC Offline
                                      Calum
                                      wrote on last edited by
                                      #21

                                      @declan Idle screw was seized?

                                      Shame, I was running the VHSA carb so it was all nicely rebuilt.

                                      Always Originate, Never Pirate!

                                      declanD 1 Reply Last reply
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                                      • CalumC Calum

                                        @declan Idle screw was seized?

                                        Shame, I was running the VHSA carb so it was all nicely rebuilt.

                                        declanD Offline
                                        declanD Offline
                                        declan
                                        wrote on last edited by
                                        #22

                                        @calum no just couldnโ€™t get it in there itโ€™s my a/f screw thatโ€™s seized

                                        1 Reply Last reply
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