KTM LC4 (640) Thread Index

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

  1. Thomas B.

    Thomas B. desert racer

    Joined:
    Feb 15, 2010
    Oddometer:
    1,001
    Location:
    Switzerland and around the globe
    Hi guys, I have a Question for you. Took the tank off today and the whole area around the upper atatchment of the breather hose from the outlet Valve cover is covered in oil. Any ideas what caused that.
    Thanks for your help
    Cheers Thomas
  2. supermoto690

    supermoto690 Been here awhile

    Joined:
    Mar 2, 2017
    Oddometer:
    108
    Thank you guys, its all good now.
    enduro0125 likes this.
  3. enduro0125

    enduro0125 Sticks and Stones™..

    Joined:
    Nov 16, 2006
    Oddometer:
    36,774
    Location:
    WNY
    So who’s remedy worked for you ?
  4. supermoto690

    supermoto690 Been here awhile

    Joined:
    Mar 2, 2017
    Oddometer:
    108
    Your idea worked hahahah I placed my hand on one end of the handlebar and hit it with my leg on the other end,the rubber bushings have twisted inside now it is straight :)
    enduro0125 likes this.
  5. enduro0125

    enduro0125 Sticks and Stones™..

    Joined:
    Nov 16, 2006
    Oddometer:
    36,774
    Location:
    WNY
    Nice!

    I love easy fixes.
  6. supermoto690

    supermoto690 Been here awhile

    Joined:
    Mar 2, 2017
    Oddometer:
    108
    Yea man this bike is amazing I mean I had a head on collision with a car and nothing is bent, they really make these bikes strong, if that happened with my other bike(aprilia shiver 750) I would be collecting pieces on the other side of the town, I bet that bike would be smashed completely.
    skibum69 likes this.
  7. Irongig

    Irongig Been here awhile

    Joined:
    Jul 14, 2017
    Oddometer:
    104
    Back from a 600 km trip off road.
    Spotted this leak on the front left side of the cylinder base.

    PITA since i’ve just had my cam roller bearings replaced.

    What would you do?
    Keep it like it is adding oil once in a while
    Open the engine, replace just the gasket
    Open the engine, change piston and what else (while you are there with engine teared apart)


    I would like to follow the first road but i’m not ae to undeestsnd if the leakage is too big to push on...

    I would like to try to check the nm of the front left nut but looks impossible to insert a socket there..

    Attached Files:

  8. enduro0125

    enduro0125 Sticks and Stones™..

    Joined:
    Nov 16, 2006
    Oddometer:
    36,774
    Location:
    WNY
    One of mine actually started to push the base gasket out on a three week trip,same spot.
    Thought the same thing,that the stud was loose.
    It wasn’t.

    Wound up gooping it with some permatex
    The third time was the charm.
    Still haven’t gotten around to fixing it permanently.
  9. supermoto690

    supermoto690 Been here awhile

    Joined:
    Mar 2, 2017
    Oddometer:
    108
    I have the same leak since the january this year, just put on some gasket seal there it will still leak but it will slow it down. I plan to replace the piston and all gaskets this winter.
  10. Jeff Sichoe

    Jeff Sichoe ruddy bastard

    Joined:
    Feb 7, 2011
    Oddometer:
    312
    Location:
    Wellington
    Yup got the same minor seep from that area, 625 SXC. Good to know it's not something super serious. I guess the Gasket just lets go after a while?
  11. skibum69

    skibum69 slave to gravity Super Supporter

    Joined:
    May 14, 2006
    Oddometer:
    11,684
    Location:
    New Melbourne, Newfoundland
    Mine went too, I had it fixed.
  12. Irongig

    Irongig Been here awhile

    Joined:
    Jul 14, 2017
    Oddometer:
    104
    Skibum did u replace just the gasket?

    I will try to slow the weeping applying red permatex..
  13. enduro0125

    enduro0125 Sticks and Stones™..

    Joined:
    Nov 16, 2006
    Oddometer:
    36,774
    Location:
    WNY
    the stuff I used was black
  14. Irongig

    Irongig Been here awhile

    Joined:
    Jul 14, 2017
    Oddometer:
    104
    Guess it’s all the same.. red is meant to be for high temperatures...
  15. enduro0125

    enduro0125 Sticks and Stones™..

    Joined:
    Nov 16, 2006
    Oddometer:
    36,774
    Location:
    WNY
    Just going for looks
  16. endurists

    endurists Adventurer

    Joined:
    Feb 28, 2008
    Oddometer:
    87
    Location:
    Talsi, Latvia
    Hi guys! Year ago i bought old lc4 640 Adventure R and it's used as second bike after FE501. Now i'm slowly solving some technical issues and the next one is clutch/shifting.
    Symphtoms:
    1) shifting gets harder as engine becomes hotter = reaches normal working temperature
    2) clutch slips after short stops. Refueling and etc. after few minutes riding stops sliping
    3) shifting is NOTICABLE harder at any time compared to all my KTM's i've owned before. (the same LC4 Adv R 98, 520exc/525EXC 530 EXC-R and now FE501)

    Oil is the same as used in FE501 (already forgot the brand, but 10w50 could be Denicol Thumperlube)
    Clutch cable freeplay is adjusted and is 1-2mm, if i adjust it for more freeplay than is harder to shift.

    Could be clutch plates worned out and warped?
  17. skibum69

    skibum69 slave to gravity Super Supporter

    Joined:
    May 14, 2006
    Oddometer:
    11,684
    Location:
    New Melbourne, Newfoundland
    Yes I replaced the gasket and the rings ended up getting replaced then too
  18. supermoto690

    supermoto690 Been here awhile

    Joined:
    Mar 2, 2017
    Oddometer:
    108
    Something is deffinetly wrong you can lay the bike on one side and remove the clutch cover so no oil will drip out, I shift without the clutch and it is soo smooth, sometimes I dont even know if I shifted because how smooth the shifter is.
  19. gunnerbuck

    gunnerbuck Island Hopper

    Joined:
    Nov 19, 2005
    Oddometer:
    6,626
    Location:
    N.V.I, B.C.
    Leak from crush washer seal on neck filler hole or leak at the banjo oil line fitting..
    enduro0125 likes this.
  20. Scaz0r

    Scaz0r Adventurer

    Joined:
    Jan 22, 2019
    Oddometer:
    53
    Location:
    Germany, Munich
    I can't find anything via search...

    I got a question regarding my clutch pull on my 2005 Adv.
    It is really heavy. Altohugh it's a hydraulic clutch.
    I fitted a Sigutech Slave cylinder, rebuilt the master cylinder and put new magura blood mineral oil in.
    It is still a very heavy pull.

    Could there be extra heavy clutch springs in the engine? Or is there any workaround to make the clutch pull easier? Maybe a different Master cylinder?
    I want to be able to ride the bike in technical stuff, without having to stay in first gear and just go a bit quicker (which may be more dangerous..).

    Everyone always says "But a KTM hydraulic is always sooo easy to pull". Yea, f you! :(