Question about Suzuki Motorcycles

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1981 Suzuki gn400 no spark

1981 Suzuki gn400 I have 6 volts power coming out of my CDI to the ignition coil but then power drops off to the spark plug and won't create spark.. Brand new ignition coil and plug and ive ran new wires. Also cleaned all ground connections. I've even studied the wiring diagram and I'm stumped.. Plz help..

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  • 13 Answers

I know it sounds silly, but have you checked your earth or ground wiring. If not earthed this type of problem can occur. Did the bike run before you replaced your coil etc? You could have a crook CDI
are you using multi meter mate for correct voltage readings?

Posted on Feb 09, 2014

  • 2 more comments 
  • Austin Jay
    Austin Jay Feb 09, 2014

    I did check over all grounds and cleaned surfaces. The bike ran well all summer until my buddy tipped it over.. Then I had no spark. I then replaced the coil and still nada

  • Chris Armstrong
    Chris Armstrong Feb 10, 2014

    definately electrical matey, but where do you start. you say 6 volts coming out of the CDI is it constant voltage, perhaps the source could be the CDI unit itself, if you have all other stuff new.

  • Austin Jay
    Austin Jay Feb 10, 2014

    Power from CDI isn't constant, it fluctuates as it should, but it hits the coil and drops off. There is some power but not enough. And it's flicking brand new, maybe I just send it back to suzuki with an angry letter demanding another coil

  • Austin Jay
    Austin Jay Feb 10, 2014

    I'm thinking it might otherwise be my CDI. Which a friend of mine just so happens to have the same bike just down the road. Only difference might be the year. But I'm still hoping for more suggestions from y'all experts. I do appreciate any helpful comments.

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CHECK SAFETY SWITCHES KICK STAND IS NOTORIOUS FOR THIS AND MAKE SURE YORE CONNECTIONS AND FUSES ARE GOOD NEUTRAL SWITCH ALSO CAN AND DOES GO BAD AND THE CLUTCH SWITCH

Posted on Jun 22, 2009

Benimur
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SOURCE: 1996 zx11 getting sprk to one bank only

Hi and welcome to FixYa,

The voltage on the green wire must be pulsating when cranking/starting the bike, not steady. Confirm by similarly testing the voltage on the black wire on the left ignition coil. If the green still reads a constant voltage, then the CDI is faulty; to be more specific, most likely that the switching tansistor inside the CDI that drives the right ignition coil has shorted.

Good luck and thank you for asking FixYa.

Posted on Jul 10, 2009

slave2aslave
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SOURCE: I have a DR250s suzuki with no spark.

Try here:
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Posted on Sep 23, 2009

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SOURCE: wiring connection for cdi unit 1981 suzuki dr 400?

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Hi, Anonymous and the usual suspects are:
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10. Security alarm failing to disarm needs reset
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4. Loose connection at ignition coil or plug between ignition sensor and module.
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4. Loose connection at ignition coil or plug between ignition sensor and module.
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6. Faulty ignition coil or CDI or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
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9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
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4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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