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Spark plug problems

I have a problem with a 1996 honda magna. 3 of the 4 spark plugs will not fire. I have replaced them and in one day they will foul out and it will start backfireing. its the same 3 that keep fouling out and the other one will always fire.

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I would 1st check to make sure the spark plug boots on your older Honda aren't arcing out prior to getting to the plugs. Anytime spark has a chance it'll take the least path of resistance and arc to the cylinder head before it makes it to the plug causing a very weak spark thus fouling out your plugs. Chances of 3 of 4 cylinders have an issue with compression is unlikely considering most older metric bikes don't see much use, plus, if there was a compression issue, it'd likely be across all 4 cylinders and not just 1. New plug boots are super cheap (around $7-$12 ea) and well worth the easy effort to see if that's the cause before you go rebuilding your engine...... It's a $48 vs. $1000 fix.

Posted on Mar 23, 2012

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Do a compression check and lets go from there. Bad rings CAN cause fouling

Posted on Nov 15, 2008

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8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
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10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Security alarm needs a reset.
For more information about your issue, please visit the websites below. Good luck and have a nice day.
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3. Loose connection at ignition coil or plug between ignition sensor and module.
4. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
5. Faulty ignition coil or ignition / electronic module
6. Failed CKP, CMP, MAP or BAS sensor.
7. Faulty ignition switch.
8. Security alarm failing to disarm.
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