Question about 2000 Harley Davidson XL 1200 C Sportster Custom
This is an intermittant problem but is occurring more regularly now. Happens when engine is hot and when engine is cold.
96 Harley FXDL, Crane hi 4 single fire ignition, 12.53 volts measured at battery terminals, all electrical connections checked for tightness and cleaned.
Forward and aft cylinder electrical leads from ignition module to coil and plug wires switched - Aft cylinder still did not fire. (Coil good)
Lead wires from module checked, intact, no apparent damage.
Module removed from nose cone, inspected, no apparent damage.
New plugs installed and gapped to manufactures specs. (approx 200 miles on new plugs)
Inline spark tester installed, when cylinder not firing very weak spark noticed, when cylinder started firing very strong spark noted.
I agree with "rselvy". Plugs will foul easily when you modify things and do short "test" starts. had it happen twice to my 2000 custom sporty. Both times the front fired but not the rear...(sometimes backfired though) plugs got carbon fouled real quik.
Posted on Mar 21, 2009
95 Evo, new plugs, new wires, started backfireing like a machine gun, front cyl. no spark at plug sometimes - would this be the coil, have not ohmed the coil yet . Thanks
Posted on May 13, 2009
The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.
Posted on Dec 08, 2008
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