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DT125R FORUM

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Need help

Scheduled Pinned Locked Moved Engine
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  • V vtrn_raptor

    So this could be my issue. The guy I brought the bike off had pinned the pv and have messed about with the carb to get it to run after changing the piston I realised their must have been an air leak somewhere on the bike as wouldn't stay running. I took the carb off to discover the mixture screw was seized so I replaced the carb the only thing I haven't done is touch the needle on the throttle and left it how I got the bike

    terry.tzT Offline
    terry.tzT Offline
    terry.tz
    wrote on last edited by
    #94

    @vtrn_raptor but before you go tinkering as I said yesterday start from the top did you replenish the fuel

    "Muddy water is best cleared by leaving it alone" Alan Watts

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    • V Offline
      V Offline
      vtrn_raptor
      wrote on last edited by
      #95

      Yeah has fresh fuel in the bike now

      terry.tzT 1 Reply Last reply
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      • V vtrn_raptor

        Yeah has fresh fuel in the bike now

        terry.tzT Offline
        terry.tzT Offline
        terry.tz
        wrote on last edited by
        #96

        @vtrn_raptor have you checked I know this is silly and I know I'm contradicting myself but considering I think its rich but check anyway is the fuel flowing fine from tank to carb

        "Muddy water is best cleared by leaving it alone" Alan Watts

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        • V Offline
          V Offline
          vtrn_raptor
          wrote on last edited by
          #97

          Yeah it is, is this In the correct position 0_1502564762654_image.jpg

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          • terry.tzT Offline
            terry.tzT Offline
            terry.tz
            wrote on last edited by
            #98

            i think that is yes but you should check manual

            "Muddy water is best cleared by leaving it alone" Alan Watts

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            • V Offline
              V Offline
              vtrn_raptor
              wrote on last edited by
              #99

              I've come to the conclusion something is wrong with the carb as wasn't having this problem with old carb but was running to lean that's the reason I got this one that's probably why I got the carb so cheap ..........

              terry.tzT 1 Reply Last reply
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              • J Offline
                J Offline
                Jens Eskildsen
                wrote on last edited by
                #100

                My clip is in the middle, yours is a noth lower, which raised the needle, making it richer.

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                • V vtrn_raptor

                  I've come to the conclusion something is wrong with the carb as wasn't having this problem with old carb but was running to lean that's the reason I got this one that's probably why I got the carb so cheap ..........

                  terry.tzT Offline
                  terry.tzT Offline
                  terry.tz
                  wrote on last edited by
                  #101

                  @vtrn_raptor have you documented the setting on the carb before you started playing with them

                  "Muddy water is best cleared by leaving it alone" Alan Watts

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                  • V Offline
                    V Offline
                    vtrn_raptor
                    wrote on last edited by
                    #102

                    The first carb couldn't check nothing as mixture screw was seized but with this one everything was set up how the Haynes said but looking at the carb compared to the old one theirs pipes missing it's got aftermarket hex screw holding the face on and what's worse is the kid I got it off kept his Dt and claimed the carb was a spare so was probably broke when I brought it can't really complain though only paid £25

                    terry.tzT 1 Reply Last reply
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                    • V vtrn_raptor

                      The first carb couldn't check nothing as mixture screw was seized but with this one everything was set up how the Haynes said but looking at the carb compared to the old one theirs pipes missing it's got aftermarket hex screw holding the face on and what's worse is the kid I got it off kept his Dt and claimed the carb was a spare so was probably broke when I brought it can't really complain though only paid £25

                      terry.tzT Offline
                      terry.tzT Offline
                      terry.tz
                      wrote on last edited by
                      #103

                      @vtrn_raptor so why did you think it could be the needle then

                      "Muddy water is best cleared by leaving it alone" Alan Watts

                      declanD 1 Reply Last reply
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                      • terry.tzT terry.tz

                        @vtrn_raptor so why did you think it could be the needle then

                        declanD Offline
                        declanD Offline
                        declan
                        wrote on last edited by
                        #104

                        @terry-tz might be missing something but given everyone is suing rich why didn't he adjust the needle to suit mine was lean and runs much better on the lowest needle clip?

                        terry.tzT 1 Reply Last reply
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                        • terry.tzT Offline
                          terry.tzT Offline
                          terry.tz
                          wrote on last edited by
                          #105

                          you keep rushing into things and you're gonna be chasing your tail like a jim carrey nut job a long time before that bikes fixed

                          "Muddy water is best cleared by leaving it alone" Alan Watts

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                          • declanD declan

                            @terry-tz might be missing something but given everyone is suing rich why didn't he adjust the needle to suit mine was lean and runs much better on the lowest needle clip?

                            terry.tzT Offline
                            terry.tzT Offline
                            terry.tz
                            wrote on last edited by
                            #106

                            @declan personally I don't think he should even have it open yet but I'm no expert

                            "Muddy water is best cleared by leaving it alone" Alan Watts

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                            • terry.tzT Offline
                              terry.tzT Offline
                              terry.tz
                              wrote on last edited by
                              #107

                              also, it's showing symptoms of rich running from start up before needle and main jet so it probably not the needle anyways

                              "Muddy water is best cleared by leaving it alone" Alan Watts

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                              • CalumC Online
                                CalumC Online
                                Calum
                                wrote on last edited by
                                #108

                                Needle clip position isn't going to make it run as rich as it is.

                                Get that carb bog stock.

                                Stlck needle, stock position, stock air screw stick idle speed.

                                It's running way too rich, but at wide open throttle it is only the main jet that you are concerned with. So why even bother with the needle position when it is not running right at wide open throttle.

                                Always Originate, Never Pirate!

                                1 Reply Last reply
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                                • J Offline
                                  J Offline
                                  Jens Eskildsen
                                  wrote on last edited by
                                  #109

                                  The needle overlaps both bottom and top end, so will fuel height in the carb, verify that its stock.

                                  CalumC 1 Reply Last reply
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                                  • J Jens Eskildsen

                                    The needle overlaps both bottom and top end, so will fuel height in the carb, verify that its stock.

                                    CalumC Online
                                    CalumC Online
                                    Calum
                                    wrote on last edited by
                                    #110

                                    @jens-eskildsen But once its wide open throttle, the needle is clear of the main jet thus no longer part of the fuel metering process.

                                    Always Originate, Never Pirate!

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                                    • J Offline
                                      J Offline
                                      Jens Eskildsen
                                      wrote on last edited by
                                      #111

                                      Try yourself mate, if you have a clean reving bike, I can promise you that making big changes to the needle will also affect just of idle, and WOT aswell.

                                      I had tonnes of issues due to the PO messing with the carb, so I've been all over this quite a few times.

                                      2-strokes are just very sensitive to jetting, half a notch on the needle on mine will make the bike go from runnning from okay to great.

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                                      • V Offline
                                        V Offline
                                        vtrn_raptor
                                        wrote on last edited by
                                        #112

                                        I did change the needle but was not different I even pinned the pv again just to see if it was the pv causing the lack of power but no it was still the same might just take my carb off and take it to fowlers and get the specialists to rebuild and clean it and see if that helps the problem as would be loads cheaper than buying a new carb

                                        CalumC 1 Reply Last reply
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                                        • J Offline
                                          J Offline
                                          Jens Eskildsen
                                          wrote on last edited by
                                          #113

                                          Yeah, somthing sounds way off.
                                          Have you checked the fuelheight in the carb? Does the carb overflow and throw gas on the ground ?

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