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1979 Hondamatic CM 400 A no spark

I have a 1979 Hondamatic cm400a that I'm rebuilding and I can't get any spark. I've checked everything and the only item that's bad is the stator, where is the best place to get one on the cheap side?

Posted by Anonymous on

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  • Honda Master
  • 48,560 Answers

Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
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 pulse coil.
8. Faulty CKP, CMP, or BAS sensor.
9. Faulty ignition switch.
10. Tilt sensor needs a reset.
11. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
1981 cm400 no spark
http://www.motorcycleforum.com/71-honda/114917-1980-honda-cm400a-no-spark.html
Honda CB400T Shop Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CB400 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Posted on Sep 25, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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wd4ity
  • 4565 Answers

SOURCE: I've checked with an Ohm meter and have continuity

If you are checking from one of the stator prongs to engine ground and you get continuity, your stator is bad. It would probably be a good idea to replace the regulator. I think Harley sells a kit that is priced fairly reasonable. But, check the rotor. I've seen one rotor that didn't have any magnetism in it. That's right, It was a genuine Harley part and the rotor had no magnetism in it. It was a friend of mine that put the stator in another guy's bike but it wouldn't charge. I checked everything and found nothing wrong except no output. Pulled it down and that's what we found. We simply put the guy's old rotor on it and it worked fine.

Good Luck
Steve

Posted on Jun 20, 2011

Testimonial: "Thanks for the advice, and I will check the new rotor if I replace it."

MakisRC51
  • 408 Answers

SOURCE: 1979 honda cm400a manuel

You can purchase it from here:http://www.amazon.com/Honda-7783-Owners-Workshop-Manual/dp/1850103593

Posted on Feb 06, 2012

searcher1974
  • 229 Answers

SOURCE: Having charging problems on a 02 ultra, when i check AC voltage at the stator plug I'm getting 53 volts - everything i've read talks about minimum reading, is my too high?

Are you checking it with the bike running at 2000rpms? If so,then no,...its within spec.

Posted on Sep 24, 2012

SOURCE: checked coil-good, wandering if stator has gone bad? this bike has a battery, does the battery need to be connected to create spark to the plug

a spark plug will not be able to spark if the battery is not properly connected, since the battery is what gives power to the spark plugs.

Posted on Jun 20, 2014

  • 1169 Answers

SOURCE: 24 HP BRIGS V TWIN only 1 cylinder is firing what else can I check

No engine numbers to work with so here something to check. Briggs V-twins has set blocking diodes in the kill wire set. If one is shorted or leaky it will cause one coil to be dead if not both.
I just went this very same thing here a few weeks ago. In my case I started out one dead coil for sure installed new coil and still had no fire. Remove the kill wire as I normally do during testing in case a short and the new coil fired fine. Easier to just replace the wire harness then repair it. Out of curiosity I checked out the wiring harness and found one diode shorted and other one leaky.

Posted on Jun 01, 2015

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2000 Honda CM 125 C weak spark


Hi, Mario67 and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
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 pulse coil.
8. Faulty CKP, CMP, or BAS sensor.
9. Faulty ignition switch.
10. Tilt sensor needs a reset.
11. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Testing Honda Coils and CDI boxes
How to diagnose no spark situation on motorcycle
http://www.guside.com/honda-cm-125-service-manual.pdf
https://www.partsfish.com/page/oem-parts-for-honda
http://mybikemanuals.com/honda

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e



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Hi, Jimmy436 the answer to this question is way above my pay grade for this situation, I would call or visit my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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https://www.partsfish.com/page/oem-parts-for-honda
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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Honda CB400T Shop Manual
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