Question about 2000 KTM 640 LC4

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Hi My 2000 LC4 Supermoto has water in the oil I have all parts to Replace Head Gasket and Seals.( Thanks to AMS KTM) What I would like to Know is how to flush out the Oil System of the creamy oil before replaceing oil and Filter

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Drain the milky oil out and buy the thinnest oil you can find. fill the engine to the top with the thin oil (dont start it up) then drain it out straight away do that once or twice then put in the proper oil and it should be ok

Posted on Aug 24, 2010

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6ya6ya
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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.
http://www.ktmforums.com/forums/supermoto/2549-ktm-640-supermoto-spark-problem-please-help.html
KTM LC4 640 SM Lost Spark
1998 2005 KTM 400 660 LC4 Enduro Service Manual Moto Data Project
http://sparepartsfinder.ktm.com/
KTM 640 LC4 Owner Manual

Nov 08, 2016 | KTM Motorcycles

2 Answers

Water getting in to engine oil i think head gasket in fine ive been told i may have a problem with the water pump is this true?


The water pump oil seals, yes. The seals keep the gearbox oil separated from the water. The only other way water can normally get into the gearbox is if you have a cracked center casing, a loose oil filler plug, bad head gasket, bad cylinder gasket, and condensation. The normal culprit is the water pump seals.

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Feb 06, 2010 | Suzuki RM 125 Motorcycles

1 Answer

Where do you top up oil on KTM LC4 640 ? Y plate


yes mate in the dipstick opening thats correct

Aug 22, 2009 | 2002 KTM 640 LC4

1 Answer

Weak spark.got oil in stator casing.is this ok?


Hi ridge,

good move will be have the recoil replaced and have the seals around the stator cleaned / investigated / repaired.

here is a good section from Supermoto Junkies on SX525

http://www.supermotojunkie.com/forumdisplay.php?f=43&order=desc&page=58

regards,

voodoo

Jul 11, 2009 | 2003 KTM SX 525 Racing

1 Answer

I have a 1995 620 ktm LC4 looking for the wiring sequence on the key ignition my kid pulled them off


Download a free service manual at the site below. Your manual is 9th on the KTM list. The wiring diagram may be in the manual.

http://www.carlsalter.com/motorcycle-manuals.asp

Please rate this answer. Thanks!

Apr 18, 2009 | 2000 KTM 640 LC4

1 Answer

KTM LC4 625


Hi and welcome to FixYa,

It would seem you posted twice, pls try here, here or here. In some, the wiring diagram is part of the Service Manual. If the year is different, most harness/wiring would be relatively similar.

Good luck and Thank you for using FixYa. Happy Holidays.

Dec 14, 2008 | 2002 KTM LC4 625 Sc

1 Answer

Water leak


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.,,,

Nov 10, 2008 | 2002 KTM LC4 640 Adventure

1 Answer

Water leak


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.,,,

Nov 10, 2008 | 2002 KTM 640 LC4

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