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DT125R FORUM

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The Leviathan Project

Scheduled Pinned Locked Moved DTRE
4dlzeeltronicdtreleviathanbelgarda
132 Posts 23 Posters 58.9k Views 4 Watching
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  • CalumC Offline
    CalumC Offline
    Calum
    wrote on last edited by
    #114

    Wrap around exhausts are a compromise for clearance. This would be no good off road, but designed to be performant.

    Jetting wise, on my vhsa, it's a tad lean. Breaking up in the mid range before it comes on pipe. Compare that to the dep pipe same setup, it was far too rich. So it is definitely utilising the fuel better.

    Always Originate, Never Pirate!

    NINJAN 1 Reply Last reply
    1
    • CalumC Calum

      Wrap around exhausts are a compromise for clearance. This would be no good off road, but designed to be performant.

      Jetting wise, on my vhsa, it's a tad lean. Breaking up in the mid range before it comes on pipe. Compare that to the dep pipe same setup, it was far too rich. So it is definitely utilising the fuel better.

      NINJAN Offline
      NINJAN Offline
      NINJA
      wrote on last edited by
      #115

      @Calum Do you need some extra bling???

      https://www.ebay.co.uk/itm/Aluminium-brake-clutch-reservoir-cover-engraved-alloy-yamaha-logo/163643491800?hash=item2619e985d8ⓂmLM5llX4n76gdhiuwe6YFPw

      SEDUCED BY THE DARK SIDE!!!

      CalumC 1 Reply Last reply
      1
      • NINJAN NINJA

        @Calum Do you need some extra bling???

        https://www.ebay.co.uk/itm/Aluminium-brake-clutch-reservoir-cover-engraved-alloy-yamaha-logo/163643491800?hash=item2619e985d8ⓂmLM5llX4n76gdhiuwe6YFPw

        CalumC Offline
        CalumC Offline
        Calum
        wrote on last edited by
        #116

        @NINJA Yeah I like that. Is that the rear reservoir cause everything else is non-standard...

        Always Originate, Never Pirate!

        NINJAN 2 Replies Last reply
        0
        • CalumC Calum

          @NINJA Yeah I like that. Is that the rear reservoir cause everything else is non-standard...

          NINJAN Offline
          NINJAN Offline
          NINJA
          wrote on last edited by
          #117

          @Calum I think that it's basically a universal cap to fit any 50mm diameter reservoir, so it can be used on either the front or rear. 😉

          SEDUCED BY THE DARK SIDE!!!

          1 Reply Last reply
          0
          • CalumC Calum

            @NINJA Yeah I like that. Is that the rear reservoir cause everything else is non-standard...

            NINJAN Offline
            NINJAN Offline
            NINJA
            wrote on last edited by
            #118

            @Calum Is your underslung a Romeu pipe or is it custom made???

            SEDUCED BY THE DARK SIDE!!!

            CalumC 1 Reply Last reply
            0
            • NINJAN NINJA

              @Calum Is your underslung a Romeu pipe or is it custom made???

              CalumC Offline
              CalumC Offline
              Calum
              wrote on last edited by Calum
              #119

              @NINJA Yeah it's a Romeu pipe. Bought it years and years ago. 2012 I think. With a Jolly Moto silencer.

              Always Originate, Never Pirate!

              NINJAN 1 Reply Last reply
              0
              • CalumC Calum

                @NINJA Yeah it's a Romeu pipe. Bought it years and years ago. 2012 I think. With a Jolly Moto silencer.

                NINJAN Offline
                NINJAN Offline
                NINJA
                wrote on last edited by NINJA
                #120

                @Calum I thought so, I was just looking it up on ebay;

                https://www.ebay.co.uk/itm/YAMAHA-DTR-125-Stainless-Steel-Exhaust-Pipe-Hand-Made-for-DTR-DTX-E-DT125/302400217348?hash=item4668752104:g:bHIAAOSwNSxU03eA

                I spotted this MX on the web with an RS pipe fitted to it and the dude reckons it adds 9Bhp to the 122 lump!!!

                Aprilia MX125-59.jpg

                Aprilia MX125-62.jpg

                Aprilia MX125-57.jpg

                SEDUCED BY THE DARK SIDE!!!

                1 Reply Last reply
                1
                • CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by
                  #121

                  A good pipe will make or break a two stroke.

                  Pipes have such a varied affect.

                  I won't rule it out, although 9 is extreme!

                  You can get 9 BHP more, but the Power Curve would be like J (Nothing nothing Nothing ohh power change).

                  Or get a pipe where it's powerband is more well rounded.

                  A wrap around exhaust is a huge compromise in performance. It's designed for clearance, not performance in mind. And underslung really releases that last part of the performance, at the expense of clearance.

                  But it's a stylistic choice that not everyone wants. I like it, it suits me as I dont' do, or plan on doing, offroading.

                  Always Originate, Never Pirate!

                  NINJAN 1 Reply Last reply
                  0
                  • pedrobatista10P Offline
                    pedrobatista10P Offline
                    pedrobatista10
                    wrote on last edited by
                    #122

                    on my dtx i have romeu inox pipe too. i guess here in portugal, he is the best making them for dtr/x

                    1 Reply Last reply
                    1
                    • CalumC Calum

                      A good pipe will make or break a two stroke.

                      Pipes have such a varied affect.

                      I won't rule it out, although 9 is extreme!

                      You can get 9 BHP more, but the Power Curve would be like J (Nothing nothing Nothing ohh power change).

                      Or get a pipe where it's powerband is more well rounded.

                      A wrap around exhaust is a huge compromise in performance. It's designed for clearance, not performance in mind. And underslung really releases that last part of the performance, at the expense of clearance.

                      But it's a stylistic choice that not everyone wants. I like it, it suits me as I dont' do, or plan on doing, offroading.

                      NINJAN Offline
                      NINJAN Offline
                      NINJA
                      wrote on last edited by NINJA
                      #123

                      @Calum That's a Jollymoto pipe, which is very similar to Romeu's own version. It is a very unique look for-sure, the RS pipe tucks under pretty nicely tho, so it's not a total eyesore. This may be a future mod for my MX, along with other planned upgrades. The owner had other mods on it, here's his gibberish;

                      "my 41 bhp mx 125 its been tuned by 55cctuning.com they have dun all the dyno work all the tuning the beggest power mod was the jollymoto pipe off a rs 125 it gave it 9 bhp just from the pipe it was 26 bhp when i got it.the pipe made it 35 hp then i got 34 carb- racing piston-racing reeds-twinair air fliter-bigger jets that gave it 6 bhp its very fast for a 125 it run 14.flat at york dragway with a 4.9 0/60"

                      SEDUCED BY THE DARK SIDE!!!

                      1 Reply Last reply
                      0
                      • CalumC Offline
                        CalumC Offline
                        Calum
                        wrote on last edited by
                        #124

                        Highly doubt it's putting out that much power. Love to see the power
                        curve.

                        Always Originate, Never Pirate!

                        NINJAN 1 Reply Last reply
                        0
                        • CalumC Calum

                          Highly doubt it's putting out that much power. Love to see the power
                          curve.

                          NINJAN Offline
                          NINJAN Offline
                          NINJA
                          wrote on last edited by
                          #125

                          @Calum Yeah that would be interesting for-sure.

                          SEDUCED BY THE DARK SIDE!!!

                          1 Reply Last reply
                          0
                          • CalumC Offline
                            CalumC Offline
                            Calum
                            wrote on last edited by
                            #126

                            Just a note for myself in the future.

                            Front Master Cylinder 2002 RSV Mille
                            Front Forks WR250F 2003 Kayaba 46mm

                            That's the problem when you go custom, can't remember where half this stuff is from 🤣

                            Always Originate, Never Pirate!

                            declanD 1 Reply Last reply
                            0
                            • CalumC Calum

                              Just a note for myself in the future.

                              Front Master Cylinder 2002 RSV Mille
                              Front Forks WR250F 2003 Kayaba 46mm

                              That's the problem when you go custom, can't remember where half this stuff is from 🤣

                              declanD Offline
                              declanD Offline
                              declan
                              wrote on last edited by
                              #127

                              @Calum i do a similar thing if i need to remember some numbers or specs ill just send the message to my brother bit confusing though when he gets a random 47 come through in the middle of the night

                              1 Reply Last reply
                              1
                              • CalumC Offline
                                CalumC Offline
                                Calum
                                wrote on last edited by
                                #128

                                Meanwhile on this project...

                                alt text

                                I have been enjoying the Athena kit so much I thought it would benefit from a mild port.

                                Off to Mick (who seemingly loves to chat about smokers on company time 🤣) with the requirements.

                                alt text

                                In this instance I specifically didn't want the exhaust port raised, in essence the Athena kits power deliver is precisely where I want it. But the transfers, exhaust and powervalve did want a touch up.

                                alt text

                                Since the exhaust port wasn't raised I didn't need any work done to the head.

                                New piston, rings and gaskets ordered and I will endeavour to smash this on once that arrives, PJME said they are awaiting restock towards the end of this month.

                                All in all looks like a good job, but this is a VERY mild port for good reason. I have the RS for that screaming power delivery and I just didn't quite enjoy the peaky power of the ported 3MB once I had the RS and Cagiva.

                                Always Originate, Never Pirate!

                                CalumC 1 Reply Last reply
                                0
                                • CalumC Calum

                                  Meanwhile on this project...

                                  alt text

                                  I have been enjoying the Athena kit so much I thought it would benefit from a mild port.

                                  Off to Mick (who seemingly loves to chat about smokers on company time 🤣) with the requirements.

                                  alt text

                                  In this instance I specifically didn't want the exhaust port raised, in essence the Athena kits power deliver is precisely where I want it. But the transfers, exhaust and powervalve did want a touch up.

                                  alt text

                                  Since the exhaust port wasn't raised I didn't need any work done to the head.

                                  New piston, rings and gaskets ordered and I will endeavour to smash this on once that arrives, PJME said they are awaiting restock towards the end of this month.

                                  All in all looks like a good job, but this is a VERY mild port for good reason. I have the RS for that screaming power delivery and I just didn't quite enjoy the peaky power of the ported 3MB once I had the RS and Cagiva.

                                  CalumC Offline
                                  CalumC Offline
                                  Calum
                                  wrote on last edited by
                                  #129

                                  @Calum finally managed to get this fitted yesterday.

                                  alt text

                                  Some chap on eBay was selling Titanium cylinder mounts.
                                  alt text

                                  As well got a nice Yamaha Tuning Fork engraved YPVS cap.

                                  alt text

                                  Always Originate, Never Pirate!

                                  markus.wM 1 Reply Last reply
                                  1
                                  • CalumC Calum

                                    @Calum finally managed to get this fitted yesterday.

                                    alt text

                                    Some chap on eBay was selling Titanium cylinder mounts.
                                    alt text

                                    As well got a nice Yamaha Tuning Fork engraved YPVS cap.

                                    alt text

                                    markus.wM Offline
                                    markus.wM Offline
                                    markus.w
                                    wrote on last edited by
                                    #130

                                    @Calum I like that cap. Nice and subtle unlike the coloured plastic ones.

                                    1 Reply Last reply
                                    0
                                    • CalumC Offline
                                      CalumC Offline
                                      Calum
                                      wrote on last edited by Calum
                                      #131

                                      Well they had done superbly well...

                                      alt text

                                      I knew they need doing eventually. These were 10+ years old when I bought them and this has been my trusty steed for ~10+ years, once daily then stored for 4 years now just a weekend warrior.

                                      alt text

                                      Painless process to strip and rebuild and the kits are readily available on eBay.

                                      alt text

                                      All cleaned, rebuilt, new oil and refitted.

                                      alt text

                                      These are fully adjustable and I must admit, have just been on whatever setting they came with off the MX bike I bought them from. Since this is a road warrior, I've stiffened the suspension up a fair amount. I'll be interested in seeing how this now performs on the road!

                                      The last ride out I did ~70 odd miles, the handling was becoming very poor. So I'm looking forward to the next adventure on it.

                                      Always Originate, Never Pirate!

                                      1 Reply Last reply
                                      1
                                      • CalumC Calum referenced this topic on
                                      • CalumC Offline
                                        CalumC Offline
                                        Calum
                                        wrote on last edited by
                                        #132

                                        Getting there...

                                        I am pretty happy with the design, I just need to modify where the holes go as there is that gap at the bottom I want to close up. It may just be easier to drill the holes myself.

                                        I've got a quick print going now and I'll drill the holes myself and then remeasure it and do one final print. If that still comes out wrong then I'll just drill the hole myself.

                                        Ideally it would all be part of the CAD so at least if, for whatever reason, I need another one, then it would be simple enough to sort out.

                                        New rear disc ordered as mine is warped. Need a fresh set of tyres on this rude boy too. These are coming up for 10 years old now...wow 10 years 😮 scary to think.

                                        Always Originate, Never Pirate!

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