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DT125R FORUM

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  4. PIC HEAVY (wr200 topend , zeeltronic, tm34ss carb, V-force reed block,Larger radiator,DEP PIPE,)

PIC HEAVY (wr200 topend , zeeltronic, tm34ss carb, V-force reed block,Larger radiator,DEP PIPE,)

Scheduled Pinned Locked Moved DTR
tuningdtryamaha2003wr200
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  • Louis-DT-WRL Louis-DT-WR

    The 200cc part
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    Crank cases bored to fit the wr200 crankshaft
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    Enlarging the transfer ports
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    Louis-DT-WRL Offline
    Louis-DT-WRL Offline
    Louis-DT-WR
    wrote on last edited by Louis-DT-WR
    #15

    Bought this off Gumtree, all threads stripped, I had to use a m10 helicoil kit on the head studs. The powervalve was damaged so I bought a brand new one at a later date. This is the nickasil bore version and didn't need a re-bore luckily so I bought a new wiseco piston and a brand-new wr200 crankshaft, originally I bought a wiseco yamaha blaster one which did fit in with modifications to the primary drive gear but I wasn't happy with it so I swapped it.

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    Louis-DT-WRL 1 Reply Last reply
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    • Louis-DT-WRL Louis-DT-WR

      Bought this off Gumtree, all threads stripped, I had to use a m10 helicoil kit on the head studs. The powervalve was damaged so I bought a brand new one at a later date. This is the nickasil bore version and didn't need a re-bore luckily so I bought a new wiseco piston and a brand-new wr200 crankshaft, originally I bought a wiseco yamaha blaster one which did fit in with modifications to the primary drive gear but I wasn't happy with it so I swapped it.

      alt text
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      Louis-DT-WRL Offline
      Louis-DT-WRL Offline
      Louis-DT-WR
      wrote on last edited by Louis-DT-WR
      #16

      A few comparison pics
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      The new piston
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      Powdercoated in my favorite colours

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      • Louis-DT-WRL Offline
        Louis-DT-WRL Offline
        Louis-DT-WR
        wrote on last edited by Louis-DT-WR
        #17

        Old vs new haha
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        Née crank bearings
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        Test fit (I later had the crankcases sprayed) alt text

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        • Louis-DT-WRL Offline
          Louis-DT-WRL Offline
          Louis-DT-WR
          wrote on last edited by Louis-DT-WR
          #18

          Here's a close up of the wr200s boost ports (before I cleaned them) note: also bought a brand new powervalve afterwards as the dowl holes were sloppy.
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          Here's it built up (not using the tmx30 anymore)
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          • Louis-DT-WRL Offline
            Louis-DT-WRL Offline
            Louis-DT-WR
            wrote on last edited by Louis-DT-WR
            #19

            My custom intake upgrade
            Vforce v3 reed block - mikuni tm34ss carburetor
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            I cut the spigot off the reed block and centralized the flow to match the original and cut bolt holes to match
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            • Louis-DT-WRL Offline
              Louis-DT-WRL Offline
              Louis-DT-WR
              wrote on last edited by Louis-DT-WR
              #20

              I cut off the flow guide from the manifold (this is not a restrictor, people think it is but it isn't, removing it will lose performance) I do not need this as my reed block comes with one fitted.

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              • Louis-DT-WRL Offline
                Louis-DT-WRL Offline
                Louis-DT-WR
                wrote on last edited by Louis-DT-WR
                #21

                See what I mean?
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                • Louis-DT-WRL Offline
                  Louis-DT-WRL Offline
                  Louis-DT-WR
                  wrote on last edited by Louis-DT-WR
                  #22

                  I used a tm34ss from a Aprilia rs250
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                  Note the angle spigots, this makes fitting a lot more easy and the float bowl stays level

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                  • Louis-DT-WRL Offline
                    Louis-DT-WRL Offline
                    Louis-DT-WR
                    wrote on last edited by Louis-DT-WR
                    #23

                    I had to carefully enlarge the manifolds bore to 34mm and also increase the size to fit the carburetor in, I managed to add a grip step to match the carburetor (this adds more stability.)

                    Because the size of the carbs inlet I had to compromise. I tried a yz250 evos rubber boot which almost was perfect but it kept breaking due to age.

                    So plan B was like this:

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                    • Louis-DT-WRL Offline
                      Louis-DT-WRL Offline
                      Louis-DT-WR
                      wrote on last edited by Louis-DT-WR
                      #24

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                      It wasn't the nicest way, but it works well

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                      • Louis-DT-WRL Offline
                        Louis-DT-WRL Offline
                        Louis-DT-WR
                        wrote on last edited by Louis-DT-WR
                        #25

                        I also removed the top of the airbox previous to this mod

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                        • Louis-DT-WRL Offline
                          Louis-DT-WRL Offline
                          Louis-DT-WR
                          wrote on last edited by Louis-DT-WR
                          #26

                          A few pictures of it fitted.
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                          • Louis-DT-WRL Offline
                            Louis-DT-WRL Offline
                            Louis-DT-WR
                            wrote on last edited by
                            #27

                            I had to blank off the vacuum pipes on the carb and I also adjusted the autolube because of all my modifications

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                            • Louis-DT-WRL Offline
                              Louis-DT-WRL Offline
                              Louis-DT-WR
                              wrote on last edited by Louis-DT-WR
                              #28

                              I forgot to say that my DEP exhaust is for a wr200, so it's perfect for my bike. I had to make custom fixing and rubber mounts. Note how long the silencer was hahaha
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                              • Louis-DT-WRL Offline
                                Louis-DT-WRL Offline
                                Louis-DT-WR
                                wrote on last edited by Louis-DT-WR
                                #29

                                Dt125r dep and wr200 dep together. It looks like I'm punching it, can't remember the reason for that 😆
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                                • Louis-DT-WRL Offline
                                  Louis-DT-WRL Offline
                                  Louis-DT-WR
                                  wrote on last edited by Louis-DT-WR
                                  #30

                                  The silencer was a bit long 😉
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                                  So I cut it down, I'm after a different end cap if anyone has one spare?
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                                  • Biker_123B Offline
                                    Biker_123B Offline
                                    Biker_123
                                    wrote on last edited by
                                    #31

                                    This bike really is amazing and I'm totally enjoying reading through this 😃. I'm guessing all these upgrades must have cost a lot of money ,definitely worth it though lol if this was my bike I'd be scared to use it incase it got dirt on it or a scratch 😁

                                    Every problem has a solution

                                    Louis-DT-WRL 1 Reply Last reply
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                                    • Biker_123B Biker_123

                                      This bike really is amazing and I'm totally enjoying reading through this 😃. I'm guessing all these upgrades must have cost a lot of money ,definitely worth it though lol if this was my bike I'd be scared to use it incase it got dirt on it or a scratch 😁

                                      Louis-DT-WRL Offline
                                      Louis-DT-WRL Offline
                                      Louis-DT-WR
                                      wrote on last edited by
                                      #32

                                      @Biker_123 thanks a lot, not as much as you would think as I got most of the parts trade and I know a few engineers. And I sold a lot of the old parts for decent money.

                                      Stay tuned 😉

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                                      • DartyD Offline
                                        DartyD Offline
                                        Darty
                                        wrote on last edited by Darty
                                        #33

                                        Sweet ride. Beast. Did you try the 3XP 200 top end with a 125 crank before? I know its a longer stroke with the 200 series. Which one do you think was lighter? I got a WR200 top end and 200R bottom end and gearbox replacement for a rebuild but I won't have a chance to compare the two.

                                        Keep it real

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                                        • Louis-DT-WRL Offline
                                          Louis-DT-WRL Offline
                                          Louis-DT-WR
                                          wrote on last edited by
                                          #34

                                          No other won't run with a 125 crank it's like 8mm shorter stroke, also a dt200r has 0.7mm shorter stroke than a wr200 if I remember right. If you want to sell your top end I could build another engine 😉

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