Question about 2002 KTM 640 LC4

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Water leak ive just been out on my KTM 640

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LC4 Supermotofor rideand on the way back nowwater started coming out of the over flow pipe,thats on the top of the radiator,and when i was clossing the throttle,and opening it back out,there was huge smoke coming from the exhaust,i stopped at a garage to top it up,and i got hel of a job to restart it,she was just smoking her head off,when the starter was turning,can someone tell me what,they reckon has gone on it,thank you,peter,sounds like you got an airlock in your cooling system somehow which has caused the engine to overheat, boil over and pop the head gasket.,,,

Posted on Nov 10, 2008

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Posted on Jan 02, 2017

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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.
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, pick up coil, igniter, trigger coil or CDI box testing needs to be checked with an ohmmeter at 70 degrees Fahrenheit
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.
KTM LC4 640 SM Lost Spark
1998 2005 KTM 400 660 LC4 Enduro Service Manual Moto Data Project
KTM 640 LC4 Owner Manual

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1 Answer

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1 Answer

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have you checked your main fuse is the battery fully charged is there spark at the plug are you sure you havent bumped the kill switch without noticeing it

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1 Answer

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1 Answer

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1 Answer

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