Question about 2000 Harley Davidson XL 1200 C Sportster Custom

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Rear cylinder not firing

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.

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  • Rick Lindsey
    Rick Lindsey Dec 13, 2008

    My problem is with a Dyna Screaming Eagle. Plusa and high dollar ignition has been replaced. Bike started and ran for about 15 minutes and then quit again and now will not fire.

  • looneytic May 09, 2009

    same problem here. tested the coil and it was good. swapped coil anyways and replaced plugs and wires. no results. checked all connections. i believe the problem lies within the Crane Hi 4. I think it is a problem with the rev limiter potentiometer. rev limiter is cutting out the rear cylinder at random times. try moving the rev limiter up or down a hair. when i do that it will run in the new spot for a few hundred miles before returning again. once it starts again that spot on the potentiometer is dead. I really need to replace the whole ignition module but my pockets are running on E right now. but if you tried everything else, (coil, plugs, wires, connections, voltage) then you probably need a new module. i am not sure if i want another crane cams because i am finding a lot of people are having trouble with the HI-4 modules failing and it makes me nervous about there other options.

  • Anonymous Mar 18, 2014

    Bike ran fine parked it for a week and will not start coil works no fire at plugs module changed and still will not start

  • Anonymous Mar 26, 2014

    no spark on rear pot,new coil and lead still no spark,front ok so swapped coil leads, now rear ok but front no go, tci coil feed wires orange and grey give different power to test light,checked all block connecters seem ok, what next?



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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

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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

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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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