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DT125R FORUM

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  4. HELP I HAVE A SPARK WHEN IGNITION IS OFF BUT NOT WHEN ON

HELP I HAVE A SPARK WHEN IGNITION IS OFF BUT NOT WHEN ON

Scheduled Pinned Locked Moved Electrics
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  • G Offline
    G Offline
    gazza76
    wrote on last edited by
    #10

    yes i had everything stock every thing tests ok but still the same problem
    i was trying to eliminate the switches

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    • G Offline
      G Offline
      gazza76
      wrote on last edited by
      #11

      i have read somewhere that a broken wire in the loom will cause it to spark with ignition off i've tested the loom on and off the bike but all seems ok

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      • vtrtomukV Offline
        vtrtomukV Offline
        vtrtomuk
        wrote on last edited by vtrtomuk
        #12

        Hi all im going thought the same situation right now!

        Not to hijack your thread here Gazza,

        now i do have 2 looms to play with. one is a genuine Yamaha 3RM the other is a unknown.

        the genuine one i have no problems with. but the other one i have has the same issue as you Gazza, if bypass the Kill and Side stand Switch with a loop and i then bridge all the pins on the ignition block then i get no spark, however if i then remove the pins from red and brown. the spark returns.

        now the switches work by bridging the connections to red and brown and B/w to B/y respectivly.

        like i said i have a genuine 3RM loom to and that is fine so i know the components are absoulutly fine. and the bike runs

        its just with this unknown loom that i have an issue with. @gazza76 im curious to know did you get this loom from ebay a 3rd party made aftermarket one?

        Current Projects - 2003 DTR

        Have put 12 DTRs back on the road since 2010

        Owner of 4 bikes - Honda VTR1000F 1998 - Honda CBR 600 F3 1998 - Sinnis Apachie 125 2015 - Yamaha DT 125R 2003

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        • G Offline
          G Offline
          gazza76
          wrote on last edited by
          #13

          been over it again today still no joy time to send the cdi for a test it's a strange one that yours works with one and not the other
          i've seen one with the same symptoms and it was cdi and others say side stand or broken wire in the loom its only £40 to get the cdi tested so thats my next step if you do figure it out please let me know

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          • M Offline
            M Offline
            Marillionado
            wrote on last edited by
            #14
            This post is deleted!
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            • M Offline
              M Offline
              Marillionado
              wrote on last edited by
              #15

              Hi all, new to the forum and as you imagine, I have came across this very issue.
              Now, full disclosure, my 3RM was running fine until I had it all disassembled and had the frame powder coated, which tells me either I screw up the electrics beforehand or, the power coat prevents grounding.
              By any chance does anyone faced this issue after having the chassis re-painted? And if so, which areas or wires do we need to make sure are properly earthed?
              Thanks a lot and cheers from Spain.
              El Pedro

              HOTSHOT IIIH 1 Reply Last reply
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              • M Marillionado

                Hi all, new to the forum and as you imagine, I have came across this very issue.
                Now, full disclosure, my 3RM was running fine until I had it all disassembled and had the frame powder coated, which tells me either I screw up the electrics beforehand or, the power coat prevents grounding.
                By any chance does anyone faced this issue after having the chassis re-painted? And if so, which areas or wires do we need to make sure are properly earthed?
                Thanks a lot and cheers from Spain.
                El Pedro

                HOTSHOT IIIH Offline
                HOTSHOT IIIH Offline
                HOTSHOT III
                wrote on last edited by HOTSHOT III
                #16

                @Marillionado Hi, welcome to the Forum!

                Not very familiar with the 3RM but on the earlier 3NC and 3MB bikes you do need to remove the powder coat where the coil attaches to the frame for a really good earth connection. It's also where the loom earths to the frame (the black ring terminal) and IIRC this attaches at the rearmost (i.e nearest the shock) coil mount. Lastly, only one mounting point on some of the coils is an earth so it's important you mount the coil the correct way, it should look like this:

                alt text

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                • M Offline
                  M Offline
                  Marillionado
                  wrote on last edited by
                  #17

                  Mate....THANK YOU!!!

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                  • M Offline
                    M Offline
                    Marillionado
                    wrote on last edited by Marillionado
                    #18

                    While I check if that is indeed the issue, allow me to share the "before and after" of my troubled rebuild (tried uploading but it seems all my images are too large to compute, sorry):

                    Before:
                    https://drive.google.com/file/d/10vFChB0EYgA4KcdGXxD0ADUuBkG3_3L1/view?usp=drive_link

                    After:
                    https://drive.google.com/file/d/1-vahreq0O_fcCLm1wl73cvFQxRDeTEqF/view?usp=drive_link

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                    • vtrtomukV Offline
                      vtrtomukV Offline
                      vtrtomuk
                      wrote on last edited by
                      #19

                      @gazza76 sorry for the late reply, after getting the multimeter out, mine was a black earth issue, so inside the loom i had 1 wire was dead, this was the black runing from the loom to the connector block for the side stand, i also then had a Black terminal on the nutural relay at the back that was not creating a connection.

                      maybe it helps you, easiest way i found was mulitmeter to the frame earth point at the coil. and stick the meter in contunaty mode, should beep when you touch the prongs together. and then probe all the black earths across the loom.

                      Cheers

                      Current Projects - 2003 DTR

                      Have put 12 DTRs back on the road since 2010

                      Owner of 4 bikes - Honda VTR1000F 1998 - Honda CBR 600 F3 1998 - Sinnis Apachie 125 2015 - Yamaha DT 125R 2003

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