Question about Honda Motorcycles
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
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
Honda CB400T Shop Manual
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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Posted on Jan 02, 2017
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.
Posted on Jun 20, 2011
Testimonial: "Thanks for the advice, and I will check the new rotor if I replace it."
Are you checking it with the bike running at 2000rpms? If so,then no,...its within spec.
Posted on Sep 24, 2012
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
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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