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DT125R FORUM

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Hello All

Scheduled Pinned Locked Moved General Discussion
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  • SamRatBoyS SamRatBoy

    Thanks, a tad crazy maybe 🙂 im not great at documenting my work but i hope i can put some intresting stuff up Terry. Im going to re-install the Yz engine at some point but im in no rush + re vitalising my old Cagiva Mito is next on the list at the moment.
    I think my username from the old site was just SamM Calum or could of been SMeadowcroft i cant remember 😞 no worries if you cant find anything.

    CalumC Offline
    CalumC Offline
    Calum
    wrote on last edited by Calum
    #5

    @samratboy Nice what mito you got mate?

    I would love an evolution. I'm currently in the process of building an Aprilia myself.

    My brother was looking at Mitos, apparently Yamaha RD 350 YPVS conversions are really common for these!

    Always Originate, Never Pirate!

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    • MiniaM Offline
      MiniaM Offline
      Minia
      wrote on last edited by
      #6

      Welcome mate 🙂

      Yamaha DT125R Blue 2002, XT 125 1982, Yamaha WR250Z 1992, BMW GS650F 1994, Benelli BN302 2015

      1 Reply Last reply
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      • SamRatBoyS SamRatBoy

        Hello all 🙂 My names Sam and iv just joined this forum good to be back on a Dtr forum. I used to be on the old forum alot and stopped using it when the old site transferred to this site. Its been a while and im going to start playing with my Dt again so thought it only right to get back on the current forum site.

        Im a 26 year old Mechanical engineer mainly working on cnc machining form solid jobs and messing on with random projects in the background.
        Iv shoe horned a 2001 Yz125 engine into my Dtr (until i siezed it) then i put a 1988 Yz125 top end on my Dtr bottom end (didnt do a good job will be attempting again at later date) and now im back to running a fairly standard Dtr barrel with powervalve pinned in place with chemical metal and the exhaust port completely smoothed and uniformed, with a modified piston and a standard deristricted front pipe. What can i say im a self confessed dreamer/bodger 😛

        I did have a small write up about how i lightened flywheels on the old site was wondering if it has been transferred onto this site? Callum i believe you are the main Admin could you let me know if you have the photos or the full thread from the old site? No worries if not i shall just have to do another 🙂

        Anyhow good to dip my toes back in the forum world of the Dtr o look forward to browsing the build threads and queries on these great bikes, Thanks all Sam.

        NINJAN Offline
        NINJAN Offline
        NINJA
        wrote on last edited by
        #7

        @samratboy Welcome aboard buddy.

        SEDUCED BY THE DARK SIDE!!!

        declanD 1 Reply Last reply
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        • NINJAN NINJA

          @samratboy Welcome aboard buddy.

          declanD Offline
          declanD Offline
          declan
          wrote on last edited by
          #8

          @SamRatBoy welcome back buddy any info on the yz engine does it just slot in or what?

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          • SamRatBoyS Offline
            SamRatBoyS Offline
            SamRatBoy
            wrote on last edited by
            #9

            Heya 🙂 its a 1991 Mk1 Mito Cal. I got lucky with the engine didn't realize for a while but its got a 66650e Barrel on is supposedly one of the best for them, a 60809 code cagiva spanny and it came with the 7 speed bottom end with helical drive gears but i bought a 6 speed straight cut drive gear for it when the 7 speed bottom went. I much preferred the 7 speed and when i finally have some spare cash thats the bottom end i will rebuild 🙂 I do like the look of the Evos they look abit sleeker and more modern with the frame showing through the fairing. Yeah theres lots of YaMito 350s out there really common swap if youv got the money for the mounts and the huge pile of money you would need for a nice full engine setup.
            What year Aprillia you building Cal? I cant say ive ever ridden one or with one but if its out like the Mito i bet there a blast it seems to have two bands haha the only thing i would say is the front sus was very solid.
            @declan the Yz engine was not a straight slot... but it wasnt as bad as i thought it would be. I needed to make custom bushes for the rear of the engine to fit between the swingarm and to have the same inner diameter as the Dt swingarm spindle/shaft. Then up front i made some custom plates that bolted to the original mounting points on the frame for the dt engine so it would reach the yz mounting on the engine. Then i had to make a custom plates for the mounting point on the head of the engine. Then made an extremely! bodged airbox using the yz airbox boot and plate that attaches to the yz airbox, alot of cut up rear wheel inner tubes, a few plates of ally, and a fair bit of duct tape, slapped a universal igniton barrel between coil earth wires, made some random fittings to mount the twin rads onto the dt rad/oil tank braces, bent the hell out of a yz gear lever and..... i think that was about it oh and made a few mounts to hold the fmf pipe stiff. Took afair bit of time and patience. Was very fast but top speed wasnt great and was a pig/impossible to try smoothly quietly ride round town haha. Then i seized it and chipped some nikasil and had already had another version of dt engine to go back in so havent done out with the setup since.
            cost me about 650 for th 2001 engine,cdi,exhaust,carb,intake,aitbox,radiators good project regret not documenting.. Alass i will do it again one day and show you fine folk

            CalumC 1 Reply Last reply
            0
            • SamRatBoyS SamRatBoy

              Heya 🙂 its a 1991 Mk1 Mito Cal. I got lucky with the engine didn't realize for a while but its got a 66650e Barrel on is supposedly one of the best for them, a 60809 code cagiva spanny and it came with the 7 speed bottom end with helical drive gears but i bought a 6 speed straight cut drive gear for it when the 7 speed bottom went. I much preferred the 7 speed and when i finally have some spare cash thats the bottom end i will rebuild 🙂 I do like the look of the Evos they look abit sleeker and more modern with the frame showing through the fairing. Yeah theres lots of YaMito 350s out there really common swap if youv got the money for the mounts and the huge pile of money you would need for a nice full engine setup.
              What year Aprillia you building Cal? I cant say ive ever ridden one or with one but if its out like the Mito i bet there a blast it seems to have two bands haha the only thing i would say is the front sus was very solid.
              @declan the Yz engine was not a straight slot... but it wasnt as bad as i thought it would be. I needed to make custom bushes for the rear of the engine to fit between the swingarm and to have the same inner diameter as the Dt swingarm spindle/shaft. Then up front i made some custom plates that bolted to the original mounting points on the frame for the dt engine so it would reach the yz mounting on the engine. Then i had to make a custom plates for the mounting point on the head of the engine. Then made an extremely! bodged airbox using the yz airbox boot and plate that attaches to the yz airbox, alot of cut up rear wheel inner tubes, a few plates of ally, and a fair bit of duct tape, slapped a universal igniton barrel between coil earth wires, made some random fittings to mount the twin rads onto the dt rad/oil tank braces, bent the hell out of a yz gear lever and..... i think that was about it oh and made a few mounts to hold the fmf pipe stiff. Took afair bit of time and patience. Was very fast but top speed wasnt great and was a pig/impossible to try smoothly quietly ride round town haha. Then i seized it and chipped some nikasil and had already had another version of dt engine to go back in so havent done out with the setup since.
              cost me about 650 for th 2001 engine,cdi,exhaust,carb,intake,aitbox,radiators good project regret not documenting.. Alass i will do it again one day and show you fine folk

              CalumC Offline
              CalumC Offline
              Calum
              wrote on last edited by
              #10

              @samratboy Aww sweet mate. Definitely throw up a thread about your mito.

              Documenting is just one of those things, you learn to love it as you get into projects and forums are a great place to show off.

              Better than Facebook as people have to make an effort to use forums, that shows some dedication.

              It's a 2007 RS, but it's completely being built from the ground up. I started with a frame from Germany and have worked from there lol.

              Always Originate, Never Pirate!

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              • SamRatBoyS Offline
                SamRatBoyS Offline
                SamRatBoy
                wrote on last edited by
                #11

                Crikey from frame up thats going to be some build! Yeah il have to start taking photos when i start putting Mito back together again, dont expect it anytime soon though im in abit of a money hole at the moment everything i get goes out pretty much straight after pay day 😞

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                • SamRatBoyS Offline
                  SamRatBoyS Offline
                  SamRatBoy
                  wrote on last edited by
                  #12

                  Sorry to again be the forum noob but what on earth is upvoting?

                  declanD 1 Reply Last reply
                  1
                  • SamRatBoyS SamRatBoy

                    Sorry to again be the forum noob but what on earth is upvoting?

                    declanD Offline
                    declanD Offline
                    declan
                    wrote on last edited by
                    #13

                    @samratboy you see the little arrows next to quote you press the up and it up votes the post from what I gather it's kind of a like feature

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                    • terry.tzT Offline
                      terry.tzT Offline
                      terry.tz
                      wrote on last edited by
                      #14

                      that extra gear tho I always liked the idea but been told it's not really a better thing would love to ride one and find out for myself 😄

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

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

                        that extra gear tho I always liked the idea but been told it's not really a better thing would love to ride one and find out for myself 😄

                        SamRatBoyS Offline
                        SamRatBoyS Offline
                        SamRatBoy
                        wrote on last edited by
                        #15

                        @terry-tz Yeah the extra gears nice but like you say you cant really get much more out of it (without a big ass hill), its more of a cruising feature to take tyhe stress of the engine, very long ratio. Basically rag the tits off her till you get to the top of 6th then put it in 7th and it holds its speed but your not screaming the engine on a constant.

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                        • NottsbikerN Offline
                          NottsbikerN Offline
                          Nottsbiker
                          wrote on last edited by
                          #16

                          Really fancy a Super-City myself but have the TDR now and prefer the Yamaha reliability over the Cagiva's.

                          Built an RS 125 a good few years ago. Even standard full power with 34mm carb they make a really good sportsbike and one that you can have plenty of fun riding even with a full licence.

                          TBH I probably preferred the RS to my old RGV250

                          CalumC terry.tzT 2 Replies Last reply
                          1
                          • NottsbikerN Nottsbiker

                            Really fancy a Super-City myself but have the TDR now and prefer the Yamaha reliability over the Cagiva's.

                            Built an RS 125 a good few years ago. Even standard full power with 34mm carb they make a really good sportsbike and one that you can have plenty of fun riding even with a full licence.

                            TBH I probably preferred the RS to my old RGV250

                            CalumC Offline
                            CalumC Offline
                            Calum
                            wrote on last edited by
                            #17

                            @nottsbiker Really? That's surprising.

                            I would love an RGV250 😄

                            Always Originate, Never Pirate!

                            NottsbikerN 1 Reply Last reply
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                            • SamRatBoyS Offline
                              SamRatBoyS Offline
                              SamRatBoy
                              wrote on last edited by
                              #18

                              Nice! My one of my mates used to have a really clean Tdr125 in the bright blue/turquoise colour he wanted £900 off me for it when he parted with t and to this day i regret not getting it, lovely looking and as you say reliable bikes. Not as fun as the Giva mind although as you say he had it about a year and it never skipped abeat once. Admittedly i was a noob to two strokes and mechanical sympathy when i used to ride the Mito alot which is more then likely why i always had it in bits 😛

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                              • NottsbikerN Offline
                                NottsbikerN Offline
                                Nottsbiker
                                wrote on last edited by
                                #19

                                I had one of those - big and quite heavy with an awful cat in the exhaust. Not sure what they are like with a decent exhaust mind you. Hopefully my Belgarda TDR will be quicker that the Japanese version

                                1 Reply Last reply
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                                • NottsbikerN Nottsbiker

                                  Really fancy a Super-City myself but have the TDR now and prefer the Yamaha reliability over the Cagiva's.

                                  Built an RS 125 a good few years ago. Even standard full power with 34mm carb they make a really good sportsbike and one that you can have plenty of fun riding even with a full licence.

                                  TBH I probably preferred the RS to my old RGV250

                                  terry.tzT Offline
                                  terry.tzT Offline
                                  terry.tz
                                  wrote on last edited by
                                  #20

                                  @nottsbiker rs125's are lovely bikes would like another myself

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

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                                  • CalumC Calum

                                    @nottsbiker Really? That's surprising.

                                    I would love an RGV250 😄

                                    NottsbikerN Offline
                                    NottsbikerN Offline
                                    Nottsbiker
                                    wrote on last edited by
                                    #21

                                    @calum only because I was always waiting for the Suzuki power valves to drop into the cylinders and cause the engine to go pop

                                    1 Reply Last reply
                                    1
                                    • A Offline
                                      A Offline
                                      andrewj1680
                                      wrote on last edited by
                                      #22

                                      My rgv250 was a animal i find hard to believe a rs125 would come anywhere close to it

                                      NottsbikerN 1 Reply Last reply
                                      1
                                      • F Offline
                                        F Offline
                                        finnerz89
                                        wrote on last edited by
                                        #23

                                        The holy grail would be the RS250, RGV 250 lump in a proper modern frame with good brakes and suspension. Serious weapon that

                                        Current bikes:
                                        DT125X '07
                                        Street Triple R '11
                                        Aprilia ETV1000 '02

                                        Previous:
                                        DR650RSE '96
                                        FJ1200 '92

                                        CalumC 1 Reply Last reply
                                        1
                                        • F finnerz89

                                          The holy grail would be the RS250, RGV 250 lump in a proper modern frame with good brakes and suspension. Serious weapon that

                                          CalumC Offline
                                          CalumC Offline
                                          Calum
                                          wrote on last edited by
                                          #24

                                          @finnerz89 RS250 Used the RGV250 engine as standard...

                                          Always Originate, Never Pirate!

                                          F 1 Reply Last reply
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