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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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  • 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

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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
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            • 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!!!

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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

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                              • 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
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                                • 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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                                  • CalumC Calum

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

                                    NottsbikerN Offline
                                    NottsbikerN Offline
                                    Nottsbiker
                                    wrote on last edited by
                                    #40

                                    @Calum said in Another New Guy:

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

                                    The FMF on my DT200WR is like a feather in comparison to the stock one which weighs a tonne!

                                    Go after market every time 😉

                                    NINJAN 1 Reply Last reply
                                    1
                                    • NottsbikerN Nottsbiker

                                      @Calum said in Another New Guy:

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

                                      The FMF on my DT200WR is like a feather in comparison to the stock one which weighs a tonne!

                                      Go after market every time 😉

                                      NINJAN Offline
                                      NINJAN Offline
                                      NINJA
                                      wrote on last edited by
                                      #41

                                      @Nottsbiker DAMN I forgot about the FMF - great pipes too!!! 😉

                                      SEDUCED BY THE DARK SIDE!!!

                                      NottsbikerN 1 Reply Last reply
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                                      • NINJAN NINJA

                                        @Nottsbiker DAMN I forgot about the FMF - great pipes too!!! 😉

                                        NottsbikerN Offline
                                        NottsbikerN Offline
                                        Nottsbiker
                                        wrote on last edited by
                                        #42

                                        @NINJA yes better made than DEP too!

                                        1 Reply Last reply
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                                        • D Offline
                                          D Offline
                                          d3cme
                                          wrote on last edited by
                                          #43

                                          So I may have sorted my problem... I say may, because it makes sense but am yet to test.

                                          On another forum I found some posts from about 8 years ago outlining someone else’s derestriction journey. Looks like he had a 2003 french import DTR, so very close to mine.

                                          He found that the Powervalve under the pully was a diamond shape and needed turning to a derestricted state as it wasn’t flush with the exhaust port. Now I’d seen mention of a diamond shape thing somewhere and also mention of turning the powervalve but didn’t really understand what it meant. There was also a restriction in his 3MB-14160 expansion chamber just like the older models straight out of the cylinder.

                                          I was working last night so had some time this afternoon to take a look, and found my powervalve had this diamond shape on the end, and after getting the exhaust off I could feel that it wasn’t flush in the port.

                                          Now that I’ve aligned it all, and run it up the servo is back to normal (it was a bit sticky straight after turning so I guess things were gunked up where they shouldn’t be).

                                          Annoyingly I can’t ride it currently as the gearbox oil cap is all chewed up and I had already dropped the oil and taken it out by the time I realised. Hopefully a replacement will be here tomorrow.

                                          Initially though it seems much smoother and revs more freely after warming it up a bit, but won’t know for sure until I ride it. I guess with the powervalve being out of line entirely it would have been restricted right through the rev range and ‘wide open’ still restricted as much as fully closed?

                                          Not sure if this means I’ll need to rejet... biggest worry currently so will keep an eye on the plug. Couldn’t see anything in the exhaust so hopefully be much better now.

                                          Sorry for the long post, will get a few pics up later to hopefully make sense of it all..

                                          2002 DT125R - Black

                                          NINJAN 1 Reply Last reply
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