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DT125R FORUM

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  4. No spark :(

No spark :(

Scheduled Pinned Locked Moved Electrics
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  • B Offline
    B Offline
    Bananper
    wrote on last edited by
    #1

    I was riding, ran like normal, and suddenly the bike started sputtering and it stopped, i got it home, and checked everything. The plug looked fine, it sparked good in my friends bike. I checked the coil and the wire for the spark plug cap for resistance, and it was fine. When i turn the key on it makes a spark at the plug, but when i turn the engine over it does not give any spark.

    Even though im not experienced with these kind of problems, it seems pretty weird that the bike shut off like that with nothing indicating it any suggestions

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    • CalumC Offline
      CalumC Offline
      Calum
      wrote on last edited by
      #2

      Side Stand switch, Neutral switch ,Clutch switch can cause these types of problems.

      Always Originate, Never Pirate!

      B 1 Reply Last reply
      0
      • CalumC Calum

        Side Stand switch, Neutral switch ,Clutch switch can cause these types of problems.

        B Offline
        B Offline
        Bananper
        wrote on last edited by
        #3

        @Calum how does the clutch switch work, i think it happened right after i shifted gears

        1 Reply Last reply
        0
        • CalumC Offline
          CalumC Offline
          Calum
          wrote on last edited by
          #4

          It's just a microswitch on the clutch lever that won't allow you to press the starter motor whilst in gear without the clutch engaged.

          It's only on the RE models. It would only affect the bike if it wasn't in neutral and/or only if you were using the starter motor. And IIRC it actually stops you pressing the starter, not spark.

          Does it start on a bump?

          Always Originate, Never Pirate!

          B 2 Replies Last reply
          0
          • CalumC Calum

            It's just a microswitch on the clutch lever that won't allow you to press the starter motor whilst in gear without the clutch engaged.

            It's only on the RE models. It would only affect the bike if it wasn't in neutral and/or only if you were using the starter motor. And IIRC it actually stops you pressing the starter, not spark.

            Does it start on a bump?

            B Offline
            B Offline
            Bananper
            wrote on last edited by
            #5

            @Calum no spark when bumpstarting, my starter motor has not worked for a long time.

            1 Reply Last reply
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            • CalumC Calum

              It's just a microswitch on the clutch lever that won't allow you to press the starter motor whilst in gear without the clutch engaged.

              It's only on the RE models. It would only affect the bike if it wasn't in neutral and/or only if you were using the starter motor. And IIRC it actually stops you pressing the starter, not spark.

              Does it start on a bump?

              B Offline
              B Offline
              Bananper
              wrote on last edited by
              #6

              @Calum the side stand switch is looped, the neutral switch is disconnected so the bike thinks it is in gear all the time

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              • CalumC Offline
                CalumC Offline
                Calum
                wrote on last edited by
                #7

                Right, yeah not sounding great.

                Obviously the bike wasn't designed to be like that.

                I'd be fixing all of those issues, you could be introducing issues through those facts.

                Always Originate, Never Pirate!

                B 1 Reply Last reply
                0
                • CalumC Calum

                  Right, yeah not sounding great.

                  Obviously the bike wasn't designed to be like that.

                  I'd be fixing all of those issues, you could be introducing issues through those facts.

                  B Offline
                  B Offline
                  Bananper
                  wrote on last edited by
                  #8

                  @Calum yup, but the bike worked like that for a long time so i dont really see them as problems anymore😂

                  Ive checked the coil, and there is no elecricity going into it, but i ohmed it and it seemed fine. So i guess the problem is either a wiring issue between the cdi and the coil, or the cdi itself, right?

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                  • F Offline
                    F Offline
                    frazer.c
                    wrote on last edited by
                    #9

                    Check your pulse coil(on the generator) , make sure the resistance is in range. I had a no spark issue which turned out to be open circuit on the pulse coil.

                    Also get a Haynes manual. The bike becomes so simple with a manual to hand.

                    Hope you sort it!

                    B 1 Reply Last reply
                    2
                    • F frazer.c

                      Check your pulse coil(on the generator) , make sure the resistance is in range. I had a no spark issue which turned out to be open circuit on the pulse coil.

                      Also get a Haynes manual. The bike becomes so simple with a manual to hand.

                      Hope you sort it!

                      B Offline
                      B Offline
                      Bananper
                      wrote on last edited by
                      #10

                      @frazer-c one of the wires were split in two, i just soldered it together, put a new spark plug in, and it fired up right away!

                      C 1 Reply Last reply
                      0
                      • F Offline
                        F Offline
                        frazer.c
                        wrote on last edited by
                        #11

                        Nice one!

                        1 Reply Last reply
                        1
                        • NottsbikerN Offline
                          NottsbikerN Offline
                          Nottsbiker
                          wrote on last edited by
                          #12

                          Can't beat that kind of easy repair even though they can be an arse to find 😉

                          1 Reply Last reply
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                          • B Bananper

                            @frazer-c one of the wires were split in two, i just soldered it together, put a new spark plug in, and it fired up right away!

                            C Offline
                            C Offline
                            crispy
                            wrote on last edited by crispy
                            #13

                            @bananper , Can you remember which wire? I've got no spark on a bare HT lead on my son's 2005 DT125X.

                            He has only been riding the bike for about a month. He said 2 days ago the bike became hard to start from cold (normally fires up straight away).

                            Now it won't start. Have tried bypassing the side stand and clutch switch by using a paper clip on the block connectors.

                            MadGyverM S 2 Replies Last reply
                            0
                            • C crispy

                              @bananper , Can you remember which wire? I've got no spark on a bare HT lead on my son's 2005 DT125X.

                              He has only been riding the bike for about a month. He said 2 days ago the bike became hard to start from cold (normally fires up straight away).

                              Now it won't start. Have tried bypassing the side stand and clutch switch by using a paper clip on the block connectors.

                              MadGyverM Offline
                              MadGyverM Offline
                              MadGyver
                              wrote on last edited by
                              #14

                              @crispy I had exactly the same problem after my full rebuild,it was running fine for a week and then problem starting up,weak spark,then nothing.
                              I had bad connection between the spark plug cap and the cable.

                              I need my tools and a pile of junk.....

                              1 Reply Last reply
                              2
                              • C crispy

                                @bananper , Can you remember which wire? I've got no spark on a bare HT lead on my son's 2005 DT125X.

                                He has only been riding the bike for about a month. He said 2 days ago the bike became hard to start from cold (normally fires up straight away).

                                Now it won't start. Have tried bypassing the side stand and clutch switch by using a paper clip on the block connectors.

                                S Offline
                                S Offline
                                SpookDog
                                wrote on last edited by SpookDog
                                #15

                                @crispy

                                You see where the clutch cable connects to the engine? There is a little bundle of wires coming out there? These need to be checked for continuity.
                                Also check the wire to the coil. Also ones around the CDI unit...

                                Can’t really help any more. My wiring is 2 generations before yours!. Good luck...

                                PS have you wd40’d your ignition barrel!
                                Give it a good wash and turn the key back n forth

                                C 1 Reply Last reply
                                2
                                • S SpookDog

                                  @crispy

                                  You see where the clutch cable connects to the engine? There is a little bundle of wires coming out there? These need to be checked for continuity.
                                  Also check the wire to the coil. Also ones around the CDI unit...

                                  Can’t really help any more. My wiring is 2 generations before yours!. Good luck...

                                  PS have you wd40’d your ignition barrel!
                                  Give it a good wash and turn the key back n forth

                                  C Offline
                                  C Offline
                                  crispy
                                  wrote on last edited by crispy
                                  #16

                                  @spookdog , so far I've just tried disconnecting the clutch and sidestand switches and using a paperclip on the loom block connector. Motor spins over fine but have no spark from the HT coil. If the ignition switch was at fault would the motor spin over on the electric start?

                                  My son has only been riding the bike about two months. Bike was always a first time starter. He tells me that on Wednesday the bike became hard to start from cold. I saw him struggle to get her fired up on Friday morning but he needed to get to work so was rushing. He drove the bike to work but Friday evening it wouldn't start after work. So as things stand it's got no spark on a bare HT coil lead.

                                  CalumC 1 Reply Last reply
                                  0
                                  • C crispy

                                    @spookdog , so far I've just tried disconnecting the clutch and sidestand switches and using a paperclip on the loom block connector. Motor spins over fine but have no spark from the HT coil. If the ignition switch was at fault would the motor spin over on the electric start?

                                    My son has only been riding the bike about two months. Bike was always a first time starter. He tells me that on Wednesday the bike became hard to start from cold. I saw him struggle to get her fired up on Friday morning but he needed to get to work so was rushing. He drove the bike to work but Friday evening it wouldn't start after work. So as things stand it's got no spark on a bare HT coil lead.

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

                                    @crispy Bridging the connectors with a paper clip isn't the way to solve the problem.

                                    Fix the side stand/clutch switch rather than bridging. 9/10 when I see this problem it's the side stand switch and bypassing it doesn't work as it's done incorrectly.

                                    Always Originate, Never Pirate!

                                    C 2 Replies Last reply
                                    0
                                    • CalumC Calum

                                      @crispy Bridging the connectors with a paper clip isn't the way to solve the problem.

                                      Fix the side stand/clutch switch rather than bridging. 9/10 when I see this problem it's the side stand switch and bypassing it doesn't work as it's done incorrectly.

                                      C Offline
                                      C Offline
                                      crispy
                                      wrote on last edited by crispy
                                      #18

                                      @calum , The activation pin for the side stand is moving smoothly in and out, so it's physically working fine. Do you know what reading I should be getting on the single wire feed onto the HT Coil, just so I cake see if I have a feed (power) going into it?

                                      I've got a basic multimeter and set it to 200ohms and have checked the three white wires coming out of the alternator and have an reading of 1.1 across all three wires.

                                      S 1 Reply Last reply
                                      0
                                      • C crispy

                                        @calum , The activation pin for the side stand is moving smoothly in and out, so it's physically working fine. Do you know what reading I should be getting on the single wire feed onto the HT Coil, just so I cake see if I have a feed (power) going into it?

                                        I've got a basic multimeter and set it to 200ohms and have checked the three white wires coming out of the alternator and have an reading of 1.1 across all three wires.

                                        S Offline
                                        S Offline
                                        SpookDog
                                        wrote on last edited by
                                        #19

                                        @crispy
                                        Just see if there’s any voltage at all going to it. I’m gonna hazard a guess about 12v?...

                                        As to the ignition barrel? I don’t know about RE wiring, there are many connectors inside. On my bike just disconnecting the block allowed the bike to spark

                                        C 1 Reply Last reply
                                        0
                                        • S SpookDog

                                          @crispy
                                          Just see if there’s any voltage at all going to it. I’m gonna hazard a guess about 12v?...

                                          As to the ignition barrel? I don’t know about RE wiring, there are many connectors inside. On my bike just disconnecting the block allowed the bike to spark

                                          C Offline
                                          C Offline
                                          crispy
                                          wrote on last edited by
                                          #20

                                          @spookdog , bike turns over on the electric start. I didn't think it would turn over if the switches were giving grief. Weirdly the ignition switch seems to go straight into the loom. No sign of a block connector. Mounting bolts for the ignition are those "special" Allen bolts with a nipple in the middle to stop You using an ordinary 5mm Allen key.

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