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DT125R FORUM

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  4. CB750 scrambler project

CB750 scrambler project

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  • Louis-DT-WRL Offline
    Louis-DT-WRL Offline
    Louis-DT-WR
    wrote on last edited by
    #70

    Finally got the exhaust done.
    A few final checks and some cosmetic parts then it's show time.
    alt text
    I did a patina finish to make it rustic... Showing the nickle plate under.

    alt text
    Crash bars on.. only really for a more beefy look.
    alt text

    alt text
    Can't wait to hear it ๐Ÿ˜Š
    alt text
    Definitely need to get some outside pics. The yellow walls is very distracting ๐Ÿ˜‚.
    alt text

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

      Finally got the exhaust done.
      A few final checks and some cosmetic parts then it's show time.
      alt text
      I did a patina finish to make it rustic... Showing the nickle plate under.

      alt text
      Crash bars on.. only really for a more beefy look.
      alt text

      alt text
      Can't wait to hear it ๐Ÿ˜Š
      alt text
      Definitely need to get some outside pics. The yellow walls is very distracting ๐Ÿ˜‚.
      alt text

      Louis-DT-WRL Offline
      Louis-DT-WRL Offline
      Louis-DT-WR
      wrote on last edited by
      #71

      Nearly show timing ๐Ÿ˜‚ 1st start up attempts coming soon.

      Tank now decorated.
      alt text

      alt text
      alt text

      1 Reply Last reply
      1
      • S Offline
        S Offline
        SpookDog
        wrote on last edited by
        #72

        Congrats! Itโ€™s nice to see someone doing their own thing! Nearly every ride Iโ€™ve ever had has been a butchers tripe mix of a thing. Mostly through necessity though! ๐Ÿ™„
        Iโ€™d really love to do a street tracker out of an old Honda CB 200 twin. Nice & lite yet revvy & torquey enough. Think of Girl with the dragon tattoos bike with attitude โ˜ ๏ธ
        They arenโ€™t easy to find anymore though...

        Louis-DT-WRL 1 Reply Last reply
        1
        • S SpookDog

          Congrats! Itโ€™s nice to see someone doing their own thing! Nearly every ride Iโ€™ve ever had has been a butchers tripe mix of a thing. Mostly through necessity though! ๐Ÿ™„
          Iโ€™d really love to do a street tracker out of an old Honda CB 200 twin. Nice & lite yet revvy & torquey enough. Think of Girl with the dragon tattoos bike with attitude โ˜ ๏ธ
          They arenโ€™t easy to find anymore though...

          Louis-DT-WRL Offline
          Louis-DT-WRL Offline
          Louis-DT-WR
          wrote on last edited by
          #73

          @SpookDog you could do what I did and buy a frame and build it up

          1 Reply Last reply
          1
          • Louis-DT-WRL Offline
            Louis-DT-WRL Offline
            Louis-DT-WR
            wrote on last edited by
            #74

            I'm not very familiar with this bike or twin terminal coils.

            Bike won't start, I believe it's electrical problem.
            No spark.

            The CDI I bought might be the problem.

            On the coil it has 2 electrical connectors (both +) and earth's to chassis.

            Ignition on and kill switch to run the voltage on 1 terminal (yellow and blue wire) to both coils has 12v.

            But there nothing on the other 2 black / white wires. Not even when cranking over.
            Surely there should be 12v to both terminals?

            1 Reply Last reply
            0
            • CalumC Offline
              CalumC Offline
              Calum
              wrote on last edited by
              #75

              Depends where you are measuring from. The coils job is to take the 12V DC and step it up to 20KV. So you measuring at 12V is outside the scopes range.

              12V isn't enough to jump the spark plug gap.

              Measuring Coils is usually done through impedance test on the primary to secondary, secondary to spark plug cap. Should fall within the tolerances outlined by the manufacturer.

              Always Originate, Never Pirate!

              Louis-DT-WRL 1 Reply Last reply
              0
              • Louis-DT-WRL Offline
                Louis-DT-WRL Offline
                Louis-DT-WR
                wrote on last edited by
                #76
                This post is deleted!
                1 Reply Last reply
                0
                • Louis-DT-WRL Offline
                  Louis-DT-WRL Offline
                  Louis-DT-WR
                  wrote on last edited by
                  #77

                  Its a wasted spark system btw

                  1 Reply Last reply
                  0
                  • CalumC Calum

                    Depends where you are measuring from. The coils job is to take the 12V DC and step it up to 20KV. So you measuring at 12V is outside the scopes range.

                    12V isn't enough to jump the spark plug gap.

                    Measuring Coils is usually done through impedance test on the primary to secondary, secondary to spark plug cap. Should fall within the tolerances outlined by the manufacturer.

                    Louis-DT-WRL Offline
                    Louis-DT-WRL Offline
                    Louis-DT-WR
                    wrote on last edited by
                    #78

                    @Calum thanks, I'm pretty sure both coils are bad. No resistance at all between power/trigger and the caps.

                    They were second hand, came with the loom.

                    12.8 volts on the looks power connectors.

                    New coils, leads and caps on order ๐Ÿคž

                    I

                    1 Reply Last reply
                    0
                    • S Offline
                      S Offline
                      SpookDog
                      wrote on last edited by
                      #79

                      Wasted spark is when they both spark at top dead centre?
                      Have you not gotten any old coil off of another bike? Even a single one that you can get to spark? It would at least prove the rest of the circuit was on par...

                      Louis-DT-WRL 1 Reply Last reply
                      1
                      • S SpookDog

                        Wasted spark is when they both spark at top dead centre?
                        Have you not gotten any old coil off of another bike? Even a single one that you can get to spark? It would at least prove the rest of the circuit was on par...

                        Louis-DT-WRL Offline
                        Louis-DT-WRL Offline
                        Louis-DT-WR
                        wrote on last edited by
                        #80

                        @SpookDog yes wasted spark system is that.

                        I've ordered new coils as the primary has 3 ohms which is fine but secondary resistance has no resistance at all. On both. This is 1 fault. I'll have to see if there is others.
                        They are very old and probably corroded inside

                        1 Reply Last reply
                        0
                        • Louis-DT-WRL Offline
                          Louis-DT-WRL Offline
                          Louis-DT-WR
                          wrote on last edited by
                          #81

                          This is the confusion I have , electrics are not my strongest point.

                          The manual says the yellow/blue wire goes at the top connector on both coils...

                          alt text
                          alt text

                          The coils are not handed so the green terminal is at the top on one side and black at the bottom when installed.

                          alt text

                          alt text

                          That's a what's confusing me ๐Ÿค”
                          I'm still waiting for the new plug caps to try.

                          I'm also not sure if I need to loop the sidestand indicator light as I removed it... I'm pretty sure it just piggybacks

                          1 Reply Last reply
                          0
                          • S Offline
                            S Offline
                            SpookDog
                            wrote on last edited by
                            #82

                            If itโ€™s connected to the ignition it could be the cause of your problem, specially if youโ€™re neutral lights not working...

                            Louis-DT-WRL 1 Reply Last reply
                            1
                            • S SpookDog

                              If itโ€™s connected to the ignition it could be the cause of your problem, specially if youโ€™re neutral lights not working...

                              Louis-DT-WRL Offline
                              Louis-DT-WRL Offline
                              Louis-DT-WR
                              wrote on last edited by
                              #83

                              @SpookDog alt text

                              Do you think that's the problem looking at this?

                              To me it looks like if the neutral light is on (which it is) it should start.

                              1 Reply Last reply
                              0
                              • CalumC Offline
                                CalumC Offline
                                Calum
                                wrote on last edited by
                                #84

                                So it looks like according to the diagram that the G/W wire needs to be tied to Earth if you want to bypass the side stand switch. The Y/Bl wire can just be taped up. I.E. don't complete the circuit for that.

                                Always Originate, Never Pirate!

                                Louis-DT-WRL 1 Reply Last reply
                                0
                                • CalumC Calum

                                  So it looks like according to the diagram that the G/W wire needs to be tied to Earth if you want to bypass the side stand switch. The Y/Bl wire can just be taped up. I.E. don't complete the circuit for that.

                                  Louis-DT-WRL Offline
                                  Louis-DT-WRL Offline
                                  Louis-DT-WR
                                  wrote on last edited by
                                  #85

                                  @Calum I have the sidestand switch, all plugged in. Only the indicator light isn't connected. Does that affect it? Cheers.

                                  Also still confused on the wires to the green or black connectors on the coils.

                                  1 Reply Last reply
                                  0
                                  • CalumC Offline
                                    CalumC Offline
                                    Calum
                                    wrote on last edited by
                                    #86

                                    The light only needs to be there if the side stand is down by the looks of it.

                                    Always Originate, Never Pirate!

                                    Louis-DT-WRL 1 Reply Last reply
                                    0
                                    • CalumC Calum

                                      The light only needs to be there if the side stand is down by the looks of it.

                                      Louis-DT-WRL Offline
                                      Louis-DT-WRL Offline
                                      Louis-DT-WR
                                      wrote on last edited by
                                      #87

                                      @Calum that's what I'm thinking but if in neutral then it shouldn't Matter ,?

                                      1 Reply Last reply
                                      0
                                      • S Offline
                                        S Offline
                                        SpookDog
                                        wrote on last edited by
                                        #88

                                        I canโ€™t get my head round the diagram at the mo. There are a lot of differences from what I know. What about the diode (number 7) condition?
                                        I know that the live wires on the coils will only affect spark timing if wrong, they should still spark. So Iโ€™m guessing that the problem is with the side stand, neutral, cutout circuit somewhere, if thereโ€™s no spark still...
                                        Sorry I canโ€™t be more help at the moโ€™. Too many brewskies!๐Ÿคช

                                        Louis-DT-WRL 2 Replies Last reply
                                        0
                                        • S SpookDog

                                          I canโ€™t get my head round the diagram at the mo. There are a lot of differences from what I know. What about the diode (number 7) condition?
                                          I know that the live wires on the coils will only affect spark timing if wrong, they should still spark. So Iโ€™m guessing that the problem is with the side stand, neutral, cutout circuit somewhere, if thereโ€™s no spark still...
                                          Sorry I canโ€™t be more help at the moโ€™. Too many brewskies!๐Ÿคช

                                          Louis-DT-WRL Offline
                                          Louis-DT-WRL Offline
                                          Louis-DT-WR
                                          wrote on last edited by
                                          #89

                                          @SpookDog yes it's a crappy diagram, I assume the second bulb is the neutral one.

                                          I've never had a diode go wrong on anything but might test it.
                                          I think it's the side stand ... I'll do more tests when the plug caps come.

                                          Thanks

                                          1 Reply Last reply
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