No Spark, Kill Switch issue?

Discussion in 'Projects/Builds' started by Jeff N, May 3, 2021.

  1. Jeff N

    Jeff N New Member

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    I know you guys hear this alot! I have a 1973 K2 and upgraded with OHTOKC CDI ignition as well as a new battery and coil. I cannot get spark. Also, I replaced the wiring harness since the old one was chewed up by a mouse. The bike has a kill switch which could be giving me trouble. How can I by-pass the kill switch? Do I just connect the 2 wires running to it together?
     
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  3. kirrbby

    kirrbby Well-Known Member

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    To disable the kill switch, just disconnect the switch. That's it. The kill switch kills the engine by grounding out the ignition (black) wire. If you disconnect the black wire, the switch can't connect it to ground.
     
  4. red69

    red69 Well-Known Member

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    If you connect the two wires, you will have a permanent kill that will not allow the engine to run.
     
  5. OLD CT

    OLD CT Well-Known Member

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    As kirrbby pointed out the black wire is the coil ignition wire. Make sure to follow that black wire from the new coil to the black wire on the conversion kit, make sure it's connected/hooked up.. Also, the green wire from the CDI kit should be grounded. I like to ground it on one of the coil mount bolts underneath. Make sure the new coil is mounted/grounded to a paint less area, exactly like the original was. The new coil should ''look and mount up'' exactly like the old coil. If not, you may have bought the wrong coil.
     
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  6. Jeff N

    Jeff N New Member

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    UPDATE:
    I have spark when I run a jumper wire from the black wire coming from CDI ignition stator to ground (new CDI ignition is firing).
    I have a weak spark when I run a jumper wire from black wire of stator to black wire of coil. I re-checked my ground which is at a coil bolt.
    I do not have spark when I connect all wires as they should be to run the bike.
    I have the following new electrical components:
    CDI ignition
    CHP wiring harness
    Honda ignition switch
    battery
    coil
    I would appreciate any or suggestions on fixing this. What would you do next?
     
  7. Jeff N

    Jeff N New Member

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  8. kirrbby

    kirrbby Well-Known Member

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    ^^^ what coil did you buy?
     
  9. Jeff N

    Jeff N New Member

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    upload_2021-5-12_10-23-51.jpeg upload_2021-5-12_10-24-23.jpeg
    This coil had 25 positive reviews and said to fit CT70.
     
  10. OLD CT

    OLD CT Well-Known Member

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    The coil seems to be good for the bike and not incorrect. You do have the new ignition switch in the frame with the retainer ring tight, meaning it is properly grounded? Correct? Have you checked the taillight ground ''green wire'' is present also?
     
  11. Jeff N

    Jeff N New Member

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    Oh man! I remember my new switch ring was not tightened down. The bike does not have a tail light. Should I just leave the wires from the harness unplugged? I won’t be back to bike until the morning and will let you know.
     
  12. OLD CT

    OLD CT Well-Known Member

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    That's two ''ground points'' for the harness, and will give a weak spark if you are running thru the harness, like you should. lol.
     
  13. Jeff N

    Jeff N New Member

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    I tightened the ignition switch and still get a yellowish weak spark. I do not have a rear light so the 2 wires from the harness are open and loose. What would you check next?
     
  14. OLD CT

    OLD CT Well-Known Member

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    Make sure the coil is in tight also. Verify the ignition/harness is correct for a K2. If the spark is strong bypassing the harness, I would question the harness/ignition switch next. K1-K2 would be the correct parts. You own both bikes, so maybe swap to test...
     
    #13 OLD CT, May 13, 2021 at 6:35 PM
    Last edited: May 13, 2021 at 6:45 PM
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  15. Gary

    Gary Well-Known Member

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    Make sure it is grounded good to the frame as well and that the engine is grounded too. Technically all the ignition switch is doing at this point is providing a way to shut off the engine by grounding the ignition. The bike will run if you unplug the switch, just won't shut off
     

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