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DT125R FORUM

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  4. Another New Guy

Another New Guy

Scheduled Pinned Locked Moved Welcome New Owners!
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  • NINJAN NINJA

    @d3cme Your water temp sensor may be knackered? Which is a possible cause to your problems, but it sounds like you have another problem causing the restriction. Is the power valve set up correctly? Has the YPVS (?) air bottle been removed? It's number 35 in this pic, it comes off the intake between the carb and air filter box;

    https://www.fowlersparts.co.uk/parts/4171936/dt125r-3rmm-2002-050-b/intake

    D Offline
    D Offline
    d3cme
    wrote on last edited by
    #20

    @NINJA said in Another New Guy:

    @d3cme Your water temp sensor may be knackered? Which is a possible cause to your problems, but it sounds like you have another problem causing the restriction. Is the power valve set up correctly? Has the YPVS (?) air bottle been removed? It's number 35 in this pic, it comes off the intake between the carb and air filter box;

    https://www.fowlersparts.co.uk/parts/4171936/dt125r-3rmm-2002-050-b/intake

    I can’t see anything missing but not sure I can see that part exactly.. will need to strip it back a bit more to see for sure I think.

    While I was looking I’ve got 2 ports on the carb without anything on, I got some pics and will look on that site to see if I can see the same view for the carb and work out what they are.

    2002 DT125R - Black

    NINJAN 1 Reply Last reply
    0
    • D Offline
      D Offline
      d3cme
      wrote on last edited by d3cme
      #21

      Sorry half effort answering both of you there.

      It will rev freely up to the indicated 10,500rpm redline in neutral or with the clutch in.

      Power valve seems to be ok (unless there’s nothing in there if that’s possible?) but was the first thing I checked and did need to align it but didn’t really change anything as I can’t get into the range where it would be wide open 😞 cycles as you’d expect when turning the ignition on and settles lined up now. Battery was knackered when I got the bike so I’ve replaced it, does anything else need resetting/setting up after?

      Temp sender I’ll get ordered as won’t do much good broken if nothing else (yikes how much!)

      2002 DT125R - Black

      1 Reply Last reply
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      • D d3cme

        @NINJA said in Another New Guy:

        @d3cme Your water temp sensor may be knackered? Which is a possible cause to your problems, but it sounds like you have another problem causing the restriction. Is the power valve set up correctly? Has the YPVS (?) air bottle been removed? It's number 35 in this pic, it comes off the intake between the carb and air filter box;

        https://www.fowlersparts.co.uk/parts/4171936/dt125r-3rmm-2002-050-b/intake

        I can’t see anything missing but not sure I can see that part exactly.. will need to strip it back a bit more to see for sure I think.

        While I was looking I’ve got 2 ports on the carb without anything on, I got some pics and will look on that site to see if I can see the same view for the carb and work out what they are.

        NINJAN Offline
        NINJAN Offline
        NINJA
        wrote on last edited by NINJA
        #22

        @d3cme You can't miss it dude, it sits against the frame next to the air filter cover, aka that black bottle between the fuel tap and the sprocket;

        Yamaha DT125R 2003-8.JPG

        Take and post a pic of your bike the same as the pic I posted above please dude.

        SEDUCED BY THE DARK SIDE!!!

        D 1 Reply Last reply
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        • NINJAN NINJA

          @d3cme You can't miss it dude, it sits against the frame next to the air filter cover, aka that black bottle between the fuel tap and the sprocket;

          Yamaha DT125R 2003-8.JPG

          Take and post a pic of your bike the same as the pic I posted above please dude.

          D Offline
          D Offline
          d3cme
          wrote on last edited by
          #23

          @NINJA said in Another New Guy:

          @d3cme You can't miss it dude, it sits against the frame next to the air filter cover, aka that black bottle between the fuel tap and the sprocket;

          Yamaha DT125R 2003-8.JPG

          Take and post a pic of your bike the same as the pic I posted above please dude.

          I deffo don’t have that! I’ve got the bracket now I know where it sits... can’t see where it would connect on that elbow though?

          alt text

          2002 DT125R - Black

          D CalumC 2 Replies Last reply
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          • D d3cme

            @NINJA said in Another New Guy:

            @d3cme You can't miss it dude, it sits against the frame next to the air filter cover, aka that black bottle between the fuel tap and the sprocket;

            Yamaha DT125R 2003-8.JPG

            Take and post a pic of your bike the same as the pic I posted above please dude.

            I deffo don’t have that! I’ve got the bracket now I know where it sits... can’t see where it would connect on that elbow though?

            alt text

            D Offline
            D Offline
            d3cme
            wrote on last edited by
            #24

            @d3cme said in Another New Guy:

            @NINJA said in Another New Guy:

            @d3cme You can't miss it dude, it sits against the frame next to the air filter cover, aka that black bottle between the fuel tap and the sprocket;

            Yamaha DT125R 2003-8.JPG

            Take and post a pic of your bike the same as the pic I posted above please dude.

            I deffo don’t have that! I’ve got the bracket now I know where it sits... can’t see where it would connect on that elbow though?

            alt text

            The elbow on mine looks like the alternate ‘19’ in the diagram. Not sure what it means though? No YPVS? different YPVS?

            2002 DT125R - Black

            1 Reply Last reply
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            • D d3cme

              @NINJA said in Another New Guy:

              @d3cme You can't miss it dude, it sits against the frame next to the air filter cover, aka that black bottle between the fuel tap and the sprocket;

              Yamaha DT125R 2003-8.JPG

              Take and post a pic of your bike the same as the pic I posted above please dude.

              I deffo don’t have that! I’ve got the bracket now I know where it sits... can’t see where it would connect on that elbow though?

              alt text

              CalumC Offline
              CalumC Offline
              Calum
              wrote on last edited by
              #25

              @d3cme That's fine, older DTR's don't have that bottle. I removed it from my DTRE and used an older style boot. Eventually deleted it entirely by using a pod filter.

              Always Originate, Never Pirate!

              D 1 Reply Last reply
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              • CalumC Calum

                @d3cme That's fine, older DTR's don't have that bottle. I removed it from my DTRE and used an older style boot. Eventually deleted it entirely by using a pod filter.

                D Offline
                D Offline
                d3cme
                wrote on last edited by
                #26

                @Calum said in Another New Guy:

                @d3cme That's fine, older DTR's don't have that bottle. I removed it from my DTRE and used an older style boot. Eventually deleted it entirely by using a pod filter.

                When you say older though, mines a 2002 so later DTR, but early if compared to DTX/DTRE I think? Looks like it’s how it should be as opposed to obviously missing something though.

                2002 DT125R - Black

                CalumC 1 Reply Last reply
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                • D d3cme

                  @Calum said in Another New Guy:

                  @d3cme That's fine, older DTR's don't have that bottle. I removed it from my DTRE and used an older style boot. Eventually deleted it entirely by using a pod filter.

                  When you say older though, mines a 2002 so later DTR, but early if compared to DTX/DTRE I think? Looks like it’s how it should be as opposed to obviously missing something though.

                  CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by
                  #27

                  @d3cme But it's not UKDM so who knows.

                  What I mean is, that not all DTRs came fitted with those bottles.

                  Always Originate, Never Pirate!

                  D 1 Reply Last reply
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                  • CalumC Calum

                    @d3cme But it's not UKDM so who knows.

                    What I mean is, that not all DTRs came fitted with those bottles.

                    D Offline
                    D Offline
                    d3cme
                    wrote on last edited by
                    #28

                    @Calum good point, thank you!

                    2002 DT125R - Black

                    NINJAN 1 Reply Last reply
                    0
                    • D d3cme

                      @Calum good point, thank you!

                      NINJAN Offline
                      NINJAN Offline
                      NINJA
                      wrote on last edited by
                      #29

                      @d3cme My DTR was a 2002 and when I removed that boost bottle the bike did not accelerate as fast, plus I lost 10mph off the top speed. As soon as I put it back on the bike was fast again. Now having no bottle may not affect Rpm's but it did slow the bike down. However if the CDI is mapped for a boost bottle, then surely the lack of one would affect the bikes performance???

                      SEDUCED BY THE DARK SIDE!!!

                      1 Reply Last reply
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                      • D Offline
                        D Offline
                        d3cme
                        wrote on last edited by
                        #30

                        Sadly no change still having moved the Reed Switch well out of the way.

                        Think I'll whip the exhaust off later and check there is a powervalve in there lol

                        2002 DT125R - Black

                        NINJAN 1 Reply Last reply
                        1
                        • D d3cme

                          Sadly no change still having moved the Reed Switch well out of the way.

                          Think I'll whip the exhaust off later and check there is a powervalve in there lol

                          NINJAN Offline
                          NINJAN Offline
                          NINJA
                          wrote on last edited by
                          #31

                          @d3cme There are restrictions in the exhaust front pipe too, which can only be removed by cutting it open and welding it back up. A straight swap to an aftermarket exhaust is easier and may be cheaper too. 😉

                          SEDUCED BY THE DARK SIDE!!!

                          D 1 Reply Last reply
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                          • NINJAN NINJA

                            @d3cme There are restrictions in the exhaust front pipe too, which can only be removed by cutting it open and welding it back up. A straight swap to an aftermarket exhaust is easier and may be cheaper too. 😉

                            D Offline
                            D Offline
                            d3cme
                            wrote on last edited by
                            #32

                            @NINJA said in Another New Guy:

                            @d3cme There are restrictions in the exhaust front pipe too, which can only be removed by cutting it open and welding it back up. A straight swap to an aftermarket exhaust is easier and may be cheaper too. 😉

                            Is there a way of checking? I think I saw that the 2002's have it in the larger part of the exhaust as opposed to immediately in the neck? Will I need a new gasket? I'll borrow a borescope in and see if I can make anything out.

                            Seen some bits about flipping the PV 180 degrees? Any truth in that?

                            2002 DT125R - Black

                            CalumC NINJAN 2 Replies Last reply
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                            • D d3cme

                              @NINJA said in Another New Guy:

                              @d3cme There are restrictions in the exhaust front pipe too, which can only be removed by cutting it open and welding it back up. A straight swap to an aftermarket exhaust is easier and may be cheaper too. 😉

                              Is there a way of checking? I think I saw that the 2002's have it in the larger part of the exhaust as opposed to immediately in the neck? Will I need a new gasket? I'll borrow a borescope in and see if I can make anything out.

                              Seen some bits about flipping the PV 180 degrees? Any truth in that?

                              CalumC Offline
                              CalumC Offline
                              Calum
                              wrote on last edited by
                              #33

                              @d3cme Cylinders are not different.

                              The exhaust will be what's different, not the cylinder.

                              Always Originate, Never Pirate!

                              1 Reply Last reply
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                              • D d3cme

                                @NINJA said in Another New Guy:

                                @d3cme There are restrictions in the exhaust front pipe too, which can only be removed by cutting it open and welding it back up. A straight swap to an aftermarket exhaust is easier and may be cheaper too. 😉

                                Is there a way of checking? I think I saw that the 2002's have it in the larger part of the exhaust as opposed to immediately in the neck? Will I need a new gasket? I'll borrow a borescope in and see if I can make anything out.

                                Seen some bits about flipping the PV 180 degrees? Any truth in that?

                                NINJAN Offline
                                NINJAN Offline
                                NINJA
                                wrote on last edited by NINJA
                                #34

                                @d3cme You can remove the front pipe and literally stick your finger up it 😉 To feel for any restrictions, or use the borescope as you've suggested. OEM's build bikes to meet omission laws etc and therefore have restrictions in place whereas aftermarket parts remove those restrictions. It's just like the Catalytic converters on cars, they create a honeycomb/blockage like effect to slow the gasses down. Remove the cat and the gasses flow out quicker.

                                You would be better off just getting a new pipe like a DEP, Giannelli, Arrow etc. And keep your stock one if you ever come to sell it, as most of the restrictions are in the exhaust. Or if you want the ultimate in looks and performance then go for a Romeu pipe;

                                https://www.ebay.co.uk/itm/YAMAHA-DT-125-Exhaust-Pipe-DT125R-DTX-DTR-E-Complete-with-Silencer/302722809924?hash=item467baf8044:g:vnwAAOSwTA9X7TzK:rk:6:pf:0

                                As they are not only hand made but they will outperform, outlast and look simply amazing on any DTR, as well as adding value. Personally I would not waste any more effort on this, just follow the derestricting guidelines, order that bad boy and be a happy biker 24/7!!! 😉

                                SEDUCED BY THE DARK SIDE!!!

                                DartyD 1 Reply Last reply
                                1
                                • NINJAN NINJA

                                  @d3cme You can remove the front pipe and literally stick your finger up it 😉 To feel for any restrictions, or use the borescope as you've suggested. OEM's build bikes to meet omission laws etc and therefore have restrictions in place whereas aftermarket parts remove those restrictions. It's just like the Catalytic converters on cars, they create a honeycomb/blockage like effect to slow the gasses down. Remove the cat and the gasses flow out quicker.

                                  You would be better off just getting a new pipe like a DEP, Giannelli, Arrow etc. And keep your stock one if you ever come to sell it, as most of the restrictions are in the exhaust. Or if you want the ultimate in looks and performance then go for a Romeu pipe;

                                  https://www.ebay.co.uk/itm/YAMAHA-DT-125-Exhaust-Pipe-DT125R-DTX-DTR-E-Complete-with-Silencer/302722809924?hash=item467baf8044:g:vnwAAOSwTA9X7TzK:rk:6:pf:0

                                  As they are not only hand made but they will outperform, outlast and look simply amazing on any DTR, as well as adding value. Personally I would not waste any more effort on this, just follow the derestricting guidelines, order that bad boy and be a happy biker 24/7!!! 😉

                                  DartyD Offline
                                  DartyD Offline
                                  Darty
                                  wrote on last edited by
                                  #35

                                  @NINJA Your quite the salesman. A gutted standard exhaust is actually really good also.

                                  Keep it real

                                  CalumC 1 Reply Last reply
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                                  • DartyD Darty

                                    @NINJA Your quite the salesman. A gutted standard exhaust is actually really good also.

                                    CalumC Offline
                                    CalumC Offline
                                    Calum
                                    wrote on last edited by
                                    #36

                                    @Darty Agreed, but man it don't half weigh a ton!

                                    Always Originate, Never Pirate!

                                    NINJAN 1 Reply Last reply
                                    1
                                    • D Offline
                                      D Offline
                                      d3cme
                                      wrote on last edited by
                                      #37

                                      Thanks All,

                                      I think a certain amount of this is managing my expectations. I used it for work today and it was great, I think its just not got the 'kick' I was expecting from the YPVS. I'll have a look at the PV tonight and take the exhaust off to see whats what!

                                      I was actually eyeing that exhaust up earlier @NINJA, looks very nice!

                                      2002 DT125R - Black

                                      1 Reply Last reply
                                      1
                                      • CalumC Calum

                                        @Darty Agreed, but man it don't half weigh a ton!

                                        NINJAN Offline
                                        NINJAN Offline
                                        NINJA
                                        wrote on last edited by
                                        #38

                                        @Calum Which one weighs a ton - the stock pipe or the Romeu???

                                        SEDUCED BY THE DARK SIDE!!!

                                        CalumC 1 Reply Last reply
                                        0
                                        • NINJAN NINJA

                                          @Calum Which one weighs a ton - the stock pipe or the Romeu???

                                          CalumC Offline
                                          CalumC Offline
                                          Calum
                                          wrote on last edited by
                                          #39

                                          @NINJA Stock pipe. The amount of weight saved by going aftermarket is probably where 90% of the noticeable power comes from I swear!

                                          Always Originate, Never Pirate!

                                          NottsbikerN 1 Reply Last reply
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