KTM LC4 (640) Thread Index

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

  1. bikemoto

    bikemoto Tyre critic

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    Try post #1. :lol3
  2. meat popsicle

    meat popsicle Ignostic

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    I'm pretty sure any LC4 you'd want (late model years - newer than 2002) should bolt up. Might want to check with some of the specialists here that have done more than me. I've just put an 06 in my 03. Sure I didn't have the SAS stuff, so I capped that off. I'd recommend a carb rebuild while you're at it (live and learn).

    The problem is they are hard to come by - rare. KTM only imported 200 640advs into North America in 2003. Probably similar in other years - so they are uncommon on the continent. I found a low miles LC4 for sale in Australia. Spent around $1500 on it as I recall, plus a few hundred more for UPS air (don't bother with boats; they were a PITA and now are F'ed royal.

    EDIT: Lithuania - Europe should have loads of LC4s by comparison. Good luck with the search!

    eBay International is where I'd start. Could get lucky in a ADV forum flea market like this one.
    skibum69 likes this.
  3. CroatianHusky

    CroatianHusky Adventurer

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    Hi folks, I have two questions.

    1) The service manual states this when installing the cylinder:
    Is this necessary on the '05 with a new gasket? What kind of sealant should I use here?


    2) Is this section on adjusting the clutch release necessary for the model with hydraulic clutch? AFAIK they are self-adjusting.
  4. dnrobertson

    dnrobertson Big Bike, Slow Rider

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    1. I did when I rebuilt my top end last year. No leaks on my bike.
    I used Hondabond HT as recommended in the top end rebuild thread.

    2. Can't help you here.
  5. skibum69

    skibum69 slave to gravity Super Supporter

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    Damn! The parts manual tells you the part # for the 660 flywheel puller not the 640 flywheel puller. Can anyone tell me what the right one is for an '06 640A? Motion Pro doesn't have on file which one it is either. I need one asap as at the moment my bike is on its side in the driveway opened up with no way forward. AAArrrrrrrrrr!!!
  6. bikemoto

    bikemoto Tyre critic

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    The book under "tightening torques - engine" for "collar nut flywheel" is "M16x1.25 left". That should be the thread size, presumably you're looking at the nut to get it's size?

    I borrowed Clint's so I don't have to inspect, and I didn't write down the dimensions. IIRC the numbers were readily to hand at the time. And I think the puller size is not unique, it's listed for other brands.

    Edit: I did write it down. M33 x 1.5 right hand thread. So now I'm confused.

    More: https://advrider.com/f/threads/ktm-lc4-640-thread-index.86958/page-98#post-17309642

    Edit 2: So the puller needs to be M33 x 1.5 right, a male thread which screws into the flywheel female. The flywheel collar nut thread is irrelevant.
  7. skibum69

    skibum69 slave to gravity Super Supporter

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    Ok, so if I have this right the puller is M33 x 1.5 right and the nut is M16 x 1.25 which as you said doesn't matter.
    roadhammer likes this.
  8. bikemoto

    bikemoto Tyre critic

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    Yep. And the linked post has the Motion Pro description and part number, for Yamaha.
  9. roadhammer

    roadhammer Adventurer

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    I don’t have it anymore, but this is what got my flywheel off.
    IMG_3089.jpg
  10. skibum69

    skibum69 slave to gravity Super Supporter

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    Thanks folks. Just to confirm right means regular thread correct?

    I was a bit surprised not to find a thread on this topic. I'll probably start one up when I have all the bits and get it done so it's there for future.
    bikemoto and meat popsicle like this.
  11. bikemoto

    bikemoto Tyre critic

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    yes, right hand thread is normal, righty-tighty.
  12. skibum69

    skibum69 slave to gravity Super Supporter

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    As I thought...thanks

    Just double checking as there are left thread pullers too.
  13. docwyte

    docwyte Long timer

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  14. skibum69

    skibum69 slave to gravity Super Supporter

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    If I had the cash...
  15. docwyte

    docwyte Long timer

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    I'm open to offers and lowered the price to make it an easier decision for you!
  16. skibum69

    skibum69 slave to gravity Super Supporter

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  17. ADStryker

    ADStryker Adventurer

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    Just rode the southern part of the NMBDR (during the unseasonably hot weekend of Jun 18th) on my grossly overloaded 640A and noticed a couple of things I want to fix.

    Q1. Anyone know of a good motorcycle machinist in or near Albuquerque who can properly do top-end work on the 640 (e.g., valve grind, porting, cylinder boring, pressing in cylinder sleeves, etc.).

    Q2. Is there a model of Xtrig that will work with the WP BAVP 4681 shock? Or a remote hydraulic preload adjuster that would fit? Or a not-ridiculously-expensive remote-preload-adjust replacement shock that would fit properly?
  18. NBAdv20

    NBAdv20 n00b

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    Hi folks,
    I have run into some problems with my 04´ Adv... After installing the usual mods (side airbox cover, Main jet and needle position, did not drill the slide yet) the bike has a very short bog just off idle. I think that might be linked to not drilling the slide but changing needle position. But sadly the problems don´t end here. After giving her a bit more throttle (3/4 - full throttle) she will pull just fine but when backing off, the bike starts to bog and will eventually stall. After waiting for some time she will start again and I am fine with not letting loose anymore. My guesses are that its either a squeezed breather/vaccum hose or a faulty fuel pump. I have already checked for squeezed hose but couldn´t find any. But that might just be me not searching correctly. What do you make of this ?
  19. docwyte

    docwyte Long timer

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    Don't drill the slide. What jetting did you install and what's your fuel screw position?
    enduro0125 likes this.
  20. NBAdv20

    NBAdv20 n00b

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    Didn´t touch the fuel screw so I guess stock position. I installed a 160 main jet.