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DT125R FORUM

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  4. DT 125 RE Supermoto Build

DT 125 RE Supermoto Build

Scheduled Pinned Locked Moved DTRE
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  • Glynn123G Offline
    Glynn123G Offline
    Glynn123
    wrote on last edited by
    #19

    Just a little update video, done a few little subtle mods since like front tyre etc, clocked just over 1000 miles since the build and running strong, however the cheap headgasket blew so skimmed head and replaced with Athena gasket, seems good since. think it might be time for ignitech or zeeltronic next though 🤔
    https://youtu.be/WXQJr-PuTgA

    CalumC 1 Reply Last reply
    0
    • Glynn123G Glynn123

      Just a little update video, done a few little subtle mods since like front tyre etc, clocked just over 1000 miles since the build and running strong, however the cheap headgasket blew so skimmed head and replaced with Athena gasket, seems good since. think it might be time for ignitech or zeeltronic next though 🤔
      https://youtu.be/WXQJr-PuTgA

      CalumC Offline
      CalumC Offline
      Calum
      wrote on last edited by
      #20

      @glynn123 I've never been able to get those cheap gaskets to work. Seriously what's the point!

      Always Originate, Never Pirate!

      Glynn123G 1 Reply Last reply
      0
      • CalumC Calum

        @glynn123 I've never been able to get those cheap gaskets to work. Seriously what's the point!

        Glynn123G Offline
        Glynn123G Offline
        Glynn123
        wrote on last edited by
        #21

        @calum Yeah mate I know what you mean!
        When I built the engine up I was in abit of a budget after getting a new (used) barrel, getting it bored and buying a wossner piston and so on (was at collage and worked part time at mcdonalds haha). I wasnt really aware of the headgasket problems and bought the cheap ebay gasket kit which came with one, something like £10 for the full engine gasket kit haha. I installed all with gasket sealant and wellseal on the head, to be fair the head gasket lasted a good few miles, but got considerably worse after the first time the engine got above 100 degrees. Ended up pressuring the coolant when ran on longer runs and stopping circulation until my temperature gauge on the radiator read over 100 degrees from the steam!!
        Ill give wossner and yamaha their due, the piston and barrel were still immaculate, no scores and could see the honing marks like the day I got it bored after 4 boil overs and 600 odd miles. Rings werent even worn!
        Head was warped slightly by the boils so skimmed with oil stone, 2000 grit sandpaper and a polishing compound before assembling with athena gasket and a fine coating of wellseal on each surface, I dont believe in installing gaskets without sealant. Been spot on since and hasnt lost any coolant so hoping it stays that way haha!

        CalumC declanD 2 Replies Last reply
        0
        • Glynn123G Glynn123

          @calum Yeah mate I know what you mean!
          When I built the engine up I was in abit of a budget after getting a new (used) barrel, getting it bored and buying a wossner piston and so on (was at collage and worked part time at mcdonalds haha). I wasnt really aware of the headgasket problems and bought the cheap ebay gasket kit which came with one, something like £10 for the full engine gasket kit haha. I installed all with gasket sealant and wellseal on the head, to be fair the head gasket lasted a good few miles, but got considerably worse after the first time the engine got above 100 degrees. Ended up pressuring the coolant when ran on longer runs and stopping circulation until my temperature gauge on the radiator read over 100 degrees from the steam!!
          Ill give wossner and yamaha their due, the piston and barrel were still immaculate, no scores and could see the honing marks like the day I got it bored after 4 boil overs and 600 odd miles. Rings werent even worn!
          Head was warped slightly by the boils so skimmed with oil stone, 2000 grit sandpaper and a polishing compound before assembling with athena gasket and a fine coating of wellseal on each surface, I dont believe in installing gaskets without sealant. Been spot on since and hasnt lost any coolant so hoping it stays that way haha!

          CalumC Offline
          CalumC Offline
          Calum
          wrote on last edited by
          #22

          @glynn123 It shouldn't need sealant.

          Using sealant will mask problems.

          I've been there done that. You can use every other item out the cheap gasket set, but on these engines, either genuine or Athena head gasket is the way to go.

          Always Originate, Never Pirate!

          1 Reply Last reply
          0
          • Glynn123G Glynn123

            @calum Yeah mate I know what you mean!
            When I built the engine up I was in abit of a budget after getting a new (used) barrel, getting it bored and buying a wossner piston and so on (was at collage and worked part time at mcdonalds haha). I wasnt really aware of the headgasket problems and bought the cheap ebay gasket kit which came with one, something like £10 for the full engine gasket kit haha. I installed all with gasket sealant and wellseal on the head, to be fair the head gasket lasted a good few miles, but got considerably worse after the first time the engine got above 100 degrees. Ended up pressuring the coolant when ran on longer runs and stopping circulation until my temperature gauge on the radiator read over 100 degrees from the steam!!
            Ill give wossner and yamaha their due, the piston and barrel were still immaculate, no scores and could see the honing marks like the day I got it bored after 4 boil overs and 600 odd miles. Rings werent even worn!
            Head was warped slightly by the boils so skimmed with oil stone, 2000 grit sandpaper and a polishing compound before assembling with athena gasket and a fine coating of wellseal on each surface, I dont believe in installing gaskets without sealant. Been spot on since and hasnt lost any coolant so hoping it stays that way haha!

            declanD Offline
            declanD Offline
            declan
            wrote on last edited by
            #23

            @glynn123 was it dedicated head gasket sealant?

            Glynn123G 1 Reply Last reply
            0
            • declanD declan

              @glynn123 was it dedicated head gasket sealant?

              Glynn123G Offline
              Glynn123G Offline
              Glynn123
              wrote on last edited by
              #24

              @declan I used wellseal on my headgasket mate, developed by rolls Royce and used in a lot of racing engines without any gasket at all, just sealant on either surface. Top stuff and never had any trouble with it, doesn't really dry just fills minor scratches in surfaces etc

              1 Reply Last reply
              1
              • 2 Offline
                2 Offline
                2stroketerry
                wrote on last edited by
                #25

                If you get head machined flat you can get away with using a single O ring, any machine shop will cut an O ring groove cheap and use a yz O ring. 0_1525024314358_1.jpg

                0_1525024334756_2.jpg

                Glynn123G 1 Reply Last reply
                2
                • 2 2stroketerry

                  If you get head machined flat you can get away with using a single O ring, any machine shop will cut an O ring groove cheap and use a yz O ring. 0_1525024314358_1.jpg

                  0_1525024334756_2.jpg

                  Glynn123G Offline
                  Glynn123G Offline
                  Glynn123
                  wrote on last edited by
                  #26

                  @2stroketerry I considered doing this, however had a charity ride 2 days after my headgasket went so needed it running again for the weekend so just ordered an athena. My trials bikes always had O rings and never had a problem, if the athena gasket goes I will definetely go down the O ring route.

                  1 Reply Last reply
                  0
                  • Glynn123G Offline
                    Glynn123G Offline
                    Glynn123
                    wrote on last edited by
                    #27

                    Thought it might be about time to update the post, had a brilliant summer with my dt and happy to say it's performed perfectly all year, a few minor problems but nothing major. Been quite a few little mods done since I last updated this thread, I couldn't really remember to list them but you can see for yourself haha
                    alt text
                    alt text
                    alt text
                    alt text

                    1 Reply Last reply
                    1
                    • CalumC Offline
                      CalumC Offline
                      Calum
                      wrote on last edited by
                      #28

                      That really looks superb. Love the forks on it. SM setup looks grand as well

                      Always Originate, Never Pirate!

                      1 Reply Last reply
                      1
                      • F Offline
                        F Offline
                        finnerz89
                        wrote on last edited by
                        #29

                        That's looking sweet!

                        What crash bungs are they?

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

                        Previous:
                        DR650RSE '96
                        FJ1200 '92

                        1 Reply Last reply
                        1
                        • Glynn123G Offline
                          Glynn123G Offline
                          Glynn123
                          wrote on last edited by
                          #30

                          Cheers guys, they're skateboard wheels held with M8 threaded bar and nylock nuts haha

                          NINJAN 1 Reply Last reply
                          1
                          • F Offline
                            F Offline
                            finnerz89
                            wrote on last edited by
                            #31

                            Haha great idea 👌

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

                            Previous:
                            DR650RSE '96
                            FJ1200 '92

                            1 Reply Last reply
                            0
                            • Glynn123G Glynn123

                              Cheers guys, they're skateboard wheels held with M8 threaded bar and nylock nuts haha

                              NINJAN Offline
                              NINJAN Offline
                              NINJA
                              wrote on last edited by
                              #32

                              @Glynn123 So it's a six wheeler then??? :grinning_face_with_smiling_eyes: :smiling_face_with_open_mouth_closed_eyes: :smiling_face_with_open_mouth_cold_sweat: :face_with_tears_of_joy: 🤣

                              She looks DAMN fine dude, very beastly indeed!!! :ogre:

                              SEDUCED BY THE DARK SIDE!!!

                              1 Reply Last reply
                              0
                              • Glynn123G Offline
                                Glynn123G Offline
                                Glynn123
                                wrote on last edited by
                                #33

                                It's winter again, which means my DT is spread across the workshop.
                                Going for some more power for next season, plans are 32mm carb, some porting work, fresh piston and zeeltronic cdi
                                My box of goodies arrived today meaning I can start work
                                alt text
                                32mm Polini reworked PWK carburetor and some Jets to play with
                                alt text
                                I'm really happy with how this carburetor is built, one of the best I have seen in person and I've tried new Mikunis etc
                                alt text
                                alt text
                                Even managed to fit the carb in the standard DT rubber without any modification! Although it was very tight.
                                alt text
                                While I had the carb off I decided it was time to fit the carbon fiber reeds I've had laying around for over a year, doubt they make much of a difference but wont do any harm
                                alt text
                                I got the carb in and the bike runs happily on choke, although it does sound lean to me, which I expected. It won't run at all off choke but will be swapping out the pilot jet after work tomorrow for more experimentation

                                NINJAN 1 Reply Last reply
                                1
                                • stinkwheelerS Offline
                                  stinkwheelerS Offline
                                  stinkwheeler
                                  wrote on last edited by
                                  #34

                                  This is gold let us know how you get on I'm doing the exactly the same thing over the coming weeks so this may be verry helpfull 😂👌

                                  The hills are alive with the sound of ... braaaap baaaaap 😁

                                  Glynn123G 1 Reply Last reply
                                  0
                                  • Glynn123G Glynn123

                                    It's winter again, which means my DT is spread across the workshop.
                                    Going for some more power for next season, plans are 32mm carb, some porting work, fresh piston and zeeltronic cdi
                                    My box of goodies arrived today meaning I can start work
                                    alt text
                                    32mm Polini reworked PWK carburetor and some Jets to play with
                                    alt text
                                    I'm really happy with how this carburetor is built, one of the best I have seen in person and I've tried new Mikunis etc
                                    alt text
                                    alt text
                                    Even managed to fit the carb in the standard DT rubber without any modification! Although it was very tight.
                                    alt text
                                    While I had the carb off I decided it was time to fit the carbon fiber reeds I've had laying around for over a year, doubt they make much of a difference but wont do any harm
                                    alt text
                                    I got the carb in and the bike runs happily on choke, although it does sound lean to me, which I expected. It won't run at all off choke but will be swapping out the pilot jet after work tomorrow for more experimentation

                                    NINJAN Offline
                                    NINJAN Offline
                                    NINJA
                                    wrote on last edited by
                                    #35

                                    @Glynn123 Polini carb looks mint bud, the workmanship is much better than Dellorto's. How much did it set you back???

                                    SEDUCED BY THE DARK SIDE!!!

                                    Glynn123G 1 Reply Last reply
                                    0
                                    • stinkwheelerS stinkwheeler

                                      This is gold let us know how you get on I'm doing the exactly the same thing over the coming weeks so this may be verry helpfull 😂👌

                                      Glynn123G Offline
                                      Glynn123G Offline
                                      Glynn123
                                      wrote on last edited by
                                      #36

                                      @stinkwheeler will do mate, sadly doesn't seem as if anyone has tried this carburetor, or at least nobody has wrote about the process online. Shame really as there is a lot of great budget options with the PWK carburetor. I was recommended to use them by 2Stroke stuffing and BARacing. Only problem I'm finding so far is the standard airbox boot is too small for the carb, so I'm looking at buying some hose and making something up so that I can still use the standard airbox.

                                      CalumC 1 Reply Last reply
                                      0
                                      • NINJAN NINJA

                                        @Glynn123 Polini carb looks mint bud, the workmanship is much better than Dellorto's. How much did it set you back???

                                        Glynn123G Offline
                                        Glynn123G Offline
                                        Glynn123
                                        wrote on last edited by
                                        #37

                                        @NINJA it was on sale for about £110 on Racing Planet mate, and I think about £20 worth of Jets ontop of that, bargain I'd say

                                        NINJAN 1 Reply Last reply
                                        0
                                        • Glynn123G Glynn123

                                          @NINJA it was on sale for about £110 on Racing Planet mate, and I think about £20 worth of Jets ontop of that, bargain I'd say

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

                                          @Glynn123 Yeah that's a damn good price indeed!!! :thumbs_up_light_skin_tone:

                                          SEDUCED BY THE DARK SIDE!!!

                                          1 Reply Last reply
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