Question about 1975 Honda Cb 400 F

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1975 Honda Cb 400 F no spark

No spark at the spark plugs but have spark at the points@

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  • bazzz7071
    bazzz7071 Oct 28, 2012

    How about some background on the bike did you just replace the points etc.

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  • Honda Master
  • 43,096 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. Faulty run/off switch
11. Tilt sensor needs a reset.
12. 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.
CB400F No spark possible faulty kill switch
How to adjust and restore points on your vintage motorcycle
Honda CB350F CB400F Service Manual
https://www.partsfish.com/page/oem-parts-for-honda
HONDA CB400F 1989 Owner Manual

Posted on Nov 06, 2017

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Posted on Jan 02, 2017

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bill_48632
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SOURCE: 1975 Honda CB 400 F Spark plug info

Hi, your plug number for an NGK plug is D8ESL As far as the plug socket size it is a 13/16 deep well socket. The gap should be set at .07-.08mm.

Posted on Aug 23, 2009

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Remove spark plugs to make engine easier to turn over.
Rotate engine until etched line on points cam lines up with the rubbing block on one of the points.
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Rotate engine 180 degrees and repeat.
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Hook up timing light to left hand spark plug (cylinder #1)
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Shift point breaker plate left/right until timing marks align.
Hook timing light to #2 cylinder.
Run @ 2500 RPM.
Adjust remaining point sub-plate (on main point plate) until sceond timing mark aligns by timing light.

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