Question about 2008 KTM 450 SX-F

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07 ktm 450sxf wont start

Wont start , got a spark, timing right, fuel getting through, changed plug ,plug cap,coil ,wiring loom, cdi,battery,
not even trying to fire at all
the bike just stopped on the start line
have you heard of this problem before?
please help

Posted by on

  • Jon Nel May 11, 2010

    Have you checked the valve clearance ?

  • Anonymous Mar 16, 2014

    Not getting any fire to spark plug was wondering where to start cdi coil

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Take your carb out, clean the entire thing, that means every nook in that *****. do this and if still a problem write back because in most cases were n idiot is involved, this is the most over looked problem

Posted on Feb 17, 2009

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6ya6ya
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KTM Lc4 640 2004 No spark fitted a new coil still no spark tested pulsar coil got 108 ohm's getting power to CDI tested blue and white wire to coil what els is there I can do


Hi, Anthony and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
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 CDI box.
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7. Faulty safety switches clutch, kickstand, neutral, off/on etc.
8. Faulty ignition switch.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://www.ktmforums.com/forums/supermoto/2549-ktm-640-supermoto-spark-problem-please-help.html
KTM LC4 640 SM Lost Spark
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A few things,start simple disconnect the kill switch,remove the spark plug cap from the wire,check all your coneections from the stator to the cdi box to the coil.Still no spark your going to need a multi meter to check the stator and coil.If all this checks out to be good then it is your cdi box.A word of caution test these parts before replacing as they are not returnable and could get costly.A good shop could diagnose your problem in hour time.It may be money well spent if you do not understand your bikes ignition system.

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If you are able to use a digital volt meter and work your backwards from spark plug wire to coil to cdi to stator you can figure out where voltage stops.thats a fairly newer bike unless you really submerged that bike under water i dont think its the cdi box.it could be coil wire it could be coil.you want to check or change the cheaper parts before you go right to cdi because there not cheap.I have a yamaha banshee 350 and she was breaking up real bad.I thought because it was only happining on top end that the cdi was breaking down or stator was going bad.Found out with meter it was the coil wires and spark plug boots.These items have to have a certain amount of resistance or the do not conduct correctly.And spark plug wires and boots are not that exspensive.So thats why I say start from sparkplug boot and work your way back.Try that and Good Luck.

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1 Answer

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It could be a faulty coil inside the magneto, wrong timing or a problem ranging from cdi unit, wiring from the former up to the spark plug.Sometimes the cap that sits on the spark plug could cause this.Basically you are having a firing problem, which means combustion chamber is not getting the right spark for proper combustion.Sometimes even an improper ground from chassis to engine could be the cause of this problem.Hope this helps.Any questions then please ask..O I forgot, try a different spark plug,sometimes these could cause this problem.

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Hi and welcome to FixYa,

The voltage on the green wire must be pulsating when cranking/starting the bike, not steady. Confirm by similarly testing the voltage on the black wire on the left ignition coil. If the green still reads a constant voltage, then the CDI is faulty; to be more specific, most likely that the switching tansistor inside the CDI that drives the right ignition coil has shorted.

Good luck and thank you for asking FixYa.

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1 Answer

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1 Answer

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