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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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  • Irongamer727I Offline
    Irongamer727I Offline
    Irongamer727
    wrote on last edited by
    #1

    Allright, when I first bought my Dt it ran great and had a perfect spark plug. Beautiful colour! But, it was bogging once up at 70-80 kph. You constantly had to flick the gas. Really annoying. So after a while I got to grips with myself. I investigated the needle. The original position of the needle is in the middle. Mine was in the top position. Giving the least amount of fuel right?

    So I adjusted the needle, to stock position.
    A huge improvement. But still not great. It was running like this at around 20°.

    Today, this morning. It was around 6° outside. And the bike ran perfectly! Absolutely perfect.
    Don't really understand. Ideas?

    1 Reply Last reply
    0
    • CalumC Online
      CalumC Online
      Calum
      wrote on last edited by
      #2

      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.

      Always Originate, Never Pirate!

      Irongamer727I 1 Reply Last reply
      1
      • O Offline
        O Offline
        oldman
        wrote on last edited by
        #3

        Always used to enjoy a late evening cold weather blast on my LC, my mate on a kmx and another on an RD (I think!), always seemed sweeter and faster!

        1 Reply Last reply
        0
        • 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
          0
          • Irongamer727I Irongamer727

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

            CalumC Online
            CalumC Online
            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
            0
            • 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
              0
              • Irongamer727I Irongamer727

                This post is deleted!

                CalumC Online
                CalumC Online
                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!

                1 Reply Last reply
                0
                • 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

                  1 Reply Last reply
                  0
                  • 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
                    1
                    • 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 carb😉

                      declanD 1 Reply Last reply
                      0
                      • Irongamer727I Irongamer727

                        @alex_dt or just adjust the carb😉

                        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 Online
                          CalumC Online
                          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
                          0
                          • 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 😂😂 actually quite depressed now😒

                            CalumC 1 Reply Last reply
                            0
                            • declanD declan

                              @calum 😂😂 actually quite depressed now😒

                              CalumC Online
                              CalumC Online
                              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
                              0
                              • 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 happen😉)

                                declanD 1 Reply Last reply
                                0
                                • Irongamer727I Irongamer727

                                  Sorry but what are you talking about? Taking off the carb? Broken dts?(how could that happen😉)

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

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

                                  Irongamer727I 1 Reply Last reply
                                  0
                                  • declanD declan

                                    @irongamer727 I’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
                                    0
                                    • 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 I’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 I’m waiting for my new ones then I can put it back together

                                        CalumC Online
                                        CalumC Online
                                        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
                                        0
                                        • 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 couldn’t turn it I tried using a bottle top I didn’t have my tools lol

                                          CalumC 1 Reply Last reply
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