Question about 1975 Honda Cb 400 F
No spark at the spark plugs but have spark at the points@
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
HONDA CB400F 1989 Owner Manual
Posted on Nov 06, 2017
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
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
Tips for a great answer:
Sep 24, 2017 | Boating
Mar 12, 2016 | Motorcycles
Jun 09, 2014 | Cars & Trucks
Nov 03, 2013 | John Deere Garden
Jul 21, 2017 | Honda XL 125 R Motorcycles
May 04, 2011 | Triumph Bonneville Motorcycles
Sep 08, 2010 | 1973 Triumph T 100 R
Aug 25, 2010 | 1972 Honda CB 350 F0
Jun 06, 2010 | 1972 Honda CB 250
Dec 12, 2009 | 1974 Yamaha DT 360
27 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: