KTM LC4 (640) Thread Index

Discussion in 'Thumpers' started by meat popsicle, Jul 9, 2005.

  1. ElJorgio

    ElJorgio Been here awhile

    Joined:
    Aug 28, 2009
    Oddometer:
    221
    Location:
    Lubbock, Texas, USA
    the pick up coil went out on mine recently, not too hard a fix.
  2. cbig

    cbig Rift- Raft, SCooter Trash

    Joined:
    Sep 30, 2003
    Oddometer:
    1,347
    Location:
    Whittier, CA
    No simple enough to fix: problem is it going out in the field... no warning.

    When I go out in the field, I go way out there.. Death Valley, Utah. bear country Montana...a little warning be nice.
  3. ElJorgio

    ElJorgio Been here awhile

    Joined:
    Aug 28, 2009
    Oddometer:
    221
    Location:
    Lubbock, Texas, USA
    True.

    Sent from my VS986 using Tapatalk
  4. Spritz

    Spritz Teethed

    Joined:
    Oct 12, 2013
    Oddometer:
    5
    Location:
    Cold North
    Exact thing was wrong with mine some years ago. New pick up coil, no problems.
  5. bobfab

    bobfab Long timer

    Joined:
    May 11, 2009
    Oddometer:
    1,929
    Location:
    Westminster CO
    Chasing this for a co-worker. He just bought a 640e and is saying the temp light is on all the time. Based on what i researched it seems like the sensor works by grounding out if overheating. Any ideas or links? Admittedly i havent read the whole 496 pages of posts!
  6. canoeguy

    canoeguy Long timer

    Joined:
    Jun 14, 2011
    Oddometer:
    1,359
    Location:
    SW Virginia
    Looking at a local 640 enduro for $1500. What if any are the known issues? The price seems pretty good, is it?

    Thanks.
  7. TaxMan

    TaxMan Master of None

    Joined:
    Nov 3, 2008
    Oddometer:
    231
    Location:
    San Francisco, CA
    A good place to start is the link on page one of this thread called "Creeper's Looking at a used LC4?" Lots of info there.
  8. canoeguy

    canoeguy Long timer

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    Jun 14, 2011
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    SW Virginia
    Thanks. I will do that.
  9. motolab

    motolab Long timer

    Joined:
    Feb 16, 2006
    Oddometer:
    4,954
    How many miles does it have on it?

    Regards,

    Derek
  10. canoeguy

    canoeguy Long timer

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    Jun 14, 2011
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    Location:
    SW Virginia
    That's the question I have sent the seller. It just posted on craigslist and just happens to be in my small town. Now I know the guy doesn't ride much as I have never seen him on the road. We are really rural so I pretty much know all of the regular bikes and everyone knows I am the crazy guy that rides all winter and my wife is the chick that has the sidecar...you get the point. But it has an inspection sticker on it that ran out in July of this year and looks reasonably clean in the pics.

    I was thinking on finding a DR650 for a little bit more dual sport stuff but then this popped up and I thought I should check this out as I am sure it smokes the performance of the DR but likely not the maintenance and reliability.


    [​IMG]
    [​IMG]
  11. wrya1

    wrya1 Been here awhile

    Joined:
    Jun 8, 2010
    Oddometer:
    146
    At a start, reading in the aforementioned thread, factor in a water pump rebuild ("got milk" thread) and cam follower bearings for any bike over 30k km. Carb rebuild also likely. Starter clutches and cam shaft decomp pins wear too, so look at those threads as you will get an idea about inspecting the bike, mainly whether it starts on the button or not.

    Sure it's not a DR650, but if you do some preventative work yourself it can last fine. Great fun bike.
    enduro Dan and TaxMan like this.
  12. clintnz

    clintnz Trans-Global Chook Chaser

    Joined:
    May 17, 2004
    Oddometer:
    4,250
    Location:
    Rotoiti, North Is, New Zealand
    Good advice above, Remember the key point - all that stuff is unlikely to need attention before 30K km so if she's got low/moderate miles then $1500 is a bargain. If you want to be fussy, also factor in replacing the ball bearing behind the clutch with the upgraded roller bearing like the 03+ bikes have.

    Maintenance intervals are the same as DR650 but your regular service will take a little longer on the 640 due to the oil in frame & the valves are a bit harder to get at. Otherwise they're really nice to work on. If your idea of dual sport includes doing the occasional little jump or going fast up a rough trail just for the hell of it, then this is the machine to get. Suspension is in a different league to the Suzuki. The 640 is also a better fit for a taller person & vice versa with the DR.

    Cheers
    Clint
    enduro Dan, dnrobertson and TaxMan like this.
  13. Grynch

    Grynch Long timer

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    Jan 29, 2014
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    1,026
    Location:
    Bay area
    1
    1,000,004 and counting! I just do not understand why it left me stranded!
    meat popsicle likes this.
  14. NitroAcres

    NitroAcres MotoBiggots Suck

    Joined:
    Mar 28, 2010
    Oddometer:
    779
    Location:
    A ChickenHouse in NorthGeorgia
    Did it become UnStarted?
  15. MTlost

    MTlost Adventurer

    Joined:
    Aug 29, 2013
    Oddometer:
    28
    Location:
    Southwest Montana
    New LC4 owner here, I bot an 05 640 Adventure last month, the PO told me that he had the jetting set for 7500 feet. I would like to go to Death Valley this winter, would I be risking the engine if were to take this bike below sea level?
  16. enduro Dan

    enduro Dan Sticks and Stones™..

    Joined:
    Nov 16, 2006
    Oddometer:
    28,055
    Location:
    Orchard Park,NY
    If you’re below sea level you’ll drown it
  17. TaxMan

    TaxMan Master of None

    Joined:
    Nov 3, 2008
    Oddometer:
    231
    Location:
    San Francisco, CA
    I really doubt it would be an issue at all. i ride from sea level to altitudes in the 7k+ range w/o issue. my understanding is that the bst is pretty accommodating altitude change and my experience has been in line with that.

    if it will nag at you, it is probably worth pulling the tank and confirming what exact main jet and needle position you have going on. depending on the mileage and whether or not you have filters on your carb breather tubes, your carb might be due a rebuild in any event. there is a big BST Bible thread on here with a boatload of info to give you context of how your setup compares to the "norm."
  18. motolab

    motolab Long timer

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    Feb 16, 2006
    Oddometer:
    4,954
    The mixture gets leaner as you go down in altitude as the air gets denser.

    Regards,

    Derek
  19. motolab

    motolab Long timer

    Joined:
    Feb 16, 2006
    Oddometer:
    4,954
    Yes. 640LC4s are detonation prone if the mixture is too lean at sea level. This may be mitigated to an extent if you have a free flowing exhaust system together with the stock airbox lid and snorkel in place.

    Regards,

    Derek
  20. motolab

    motolab Long timer

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    Feb 16, 2006
    Oddometer:
    4,954
    Right, but yours is likely to be jetted for sea level. On the other hand 640LC4s that live at 7.5K ft and get ridden up over 14-15K ft passes mat benefit from leaning out the idle and progression circuits because these are not under the control of the slide and therefore not density compensated. This is done by installing a smaller pilot jet.
    I think that an inspection is definitely in order as otherwise carburetor condition, set up, and jetting are complete unknowns.

    Regards,

    Derek