KTM LC4 (640) Thread Index

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

  1. Low594

    Low594 Adventuring Creep

    Joined:
    Oct 28, 2008
    Oddometer:
    1,216
    Location:
    Oakland, CA
    Yes, Motolab. Derek is a great guy! What he sells are factory OEM, from Mikuni, without the KTM mark up!
  2. rperedel

    rperedel Adventurer

    Joined:
    May 8, 2009
    Oddometer:
    15
    Look for part 99(#) at the end of the fiche

    Its a bag containing a rebuild kit for around 60$

    You can order it from KTM withe the other OEM parts, or from MOTOLAB (Derek Capito) here in the forum (good adviser for anything BST Carb related)

    Regards
  3. tdreyer

    tdreyer KTiM

    Joined:
    Mar 24, 2008
    Oddometer:
    515
    Location:
    Used to live in Crestview FL, now ????
    Anyone know off hand if the fan should draw air through the radiator, thus pushing hot air through the tank/spoilers onto the riders left leg? Seems that was how it was on my SMC but the point on this SXC didn't do such a good wiring job and it has come loose.

    Should the fan blow onto the rad or pull air through it?

    Yes, I did a quick search, no I didn't find the answer. Best I can do with non factory wiring and the service manual is for it to pull air through. Any help would be greatly appreciated.
  4. biensur22

    biensur22 litigious poster

    Joined:
    Oct 26, 2011
    Oddometer:
    183
    Location:
    Denver, CO
    Judging by the heat on my left leg during my commute this morning, i'm about 90% sure it pulls air through the radiator. That and the fact that it wouldn't work particularly well when moving forward to do otherwise.
  5. Droptarotter

    Droptarotter Long timer

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    Jul 11, 2007
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    Cloverdale,BC
    Rad fans pull air through the rad.

    Cheers
  6. 640 Armageddon

    640 Armageddon Do or Do Not. There is no try.

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    Mar 4, 2009
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    3,565
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    Greece
    I second the pulling through the rad. The fan blows the air in the direction that air is supposed to go when the bike/car is moving. For example, all the normal bikes should pull air through the rads. Honda's VTR 1000, SP1, Varadero, VFR 800 etc with the rad on the side are different because the way the rads work (airflow is different). These fans push air onto the rad. You get the idea ... :freaky
  7. tdreyer

    tdreyer KTiM

    Joined:
    Mar 24, 2008
    Oddometer:
    515
    Location:
    Used to live in Crestview FL, now ????
    Thanks for the replies gentlemen :freaky
  8. makazica

    makazica Been here awhile

    Joined:
    May 17, 2008
    Oddometer:
    770
    Location:
    Zagreb, Croatia
    Pull air +1

    M.
  9. 640 Armageddon

    640 Armageddon Do or Do Not. There is no try.

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    Mar 4, 2009
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    Greece
    Now I think about it if you put the fan on the front of the rad it should push air through the rad... :huh
    Too much beer again... :freaky
  10. Droptarotter

    Droptarotter Long timer

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    Jul 11, 2007
    Oddometer:
    1,486
    Location:
    Cloverdale,BC
    What??????? No Ouzo or Retsina???

    Cheers
  11. bmwktmbill

    bmwktmbill Traveler

    Joined:
    Jul 16, 2005
    Oddometer:
    5,607
    Location:
    Traveler
    Droptarotter,

    So right!!

    [​IMG]

    [​IMG]


    Just let me add.

    KTM might be able to design a PD racer but sidestands and centerstands give them trouble.


    bill
  12. GreyDawggg

    GreyDawggg Adventure seeker

    Joined:
    Aug 24, 2009
    Oddometer:
    464
    Location:
    Perth, Western Australia
    Hi there. I wanted to get my bike licensed today but when I took my bike for a ride the lower radiator hose popped off. I got it home, tightened the hose back on and added some distilled water. I leaned it over side to side, trying to get rid of any air pockets and then ran it with the radiator cap off for a while. Topped up the with a little more water until it just covered the fins. When I took it for a ride again the same hose in the same place popped off. Has anyone had this happen before or know what might be causing pressure to pop the hose off?

    I want to get it right before I add good, expensive coolant again. Any advice would be much appreciated.. :-)
  13. 640 Armageddon

    640 Armageddon Do or Do Not. There is no try.

    Joined:
    Mar 4, 2009
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    3,565
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    Greece
    Two things out the top of my head, either the hose clamp does not apply enough force to hold the pipe in place and as pressure builds up it slides off or if the engine temp was above normal the radiator cap should open and let some water out to relief the pressure . If not then the system will fail at its weakest point which is probably in your case due to my first sentence :evil this hose...

    I would change hose clamp to begin with, fill it with distilled water, let it idle until the radiator fan pops in, then see what happens and proceed accordingly :huh

    D.
  14. Baggi'tard

    Baggi'tard Assventure rider

    Joined:
    Sep 20, 2006
    Oddometer:
    1,543
    Location:
    Farmhouse Inn, Tellico Plains, TN
    Thanks to all those who have contributed, and continue to contribute and maintain this thread. I am new to Team Orange, having recently purchased a 2000 640 E, with a bunch of 640 A additions. I am prepping the bike for CO/UT TAT riding this June. I had the bike delivered while in Afghanistan, and have just a couple weeks now, and a few weeks when I get back to make sure everything is good to go before the trip. So thanks for this thread and all the great pictures and advice, they have helped out quite a bit already.

    Kyle
  15. Droptarotter

    Droptarotter Long timer

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    Jul 11, 2007
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    Location:
    Cloverdale,BC

    The hose clamp in that area might be too long and bottoming out........it might look ok, but might just be a few twists short of proper tension.
    Another thing that pops into my pointy head is if the rad cap is the correct pressure??
    On these bikes coolant level should only be 10mm above rad core...........if topped up to bottom of filler neck..............they will puke the excess coolant out.

    Cheers
  16. mgorman

    mgorman Crashing since 1964

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    Oct 25, 2006
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    5,632
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    NEO
    Mine did the same in the middle of the forest during a dual sport. Overeating badly, the dash flashing, I limped it to lunch thinking I was abusing it on a hot day on single track.

    Didn't find out til we stopped that I'd ridden 30 minutes+ with no fluids.
  17. Low594

    Low594 Adventuring Creep

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    Oct 28, 2008
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    Oakland, CA
    I had that happen. In my case, I was dealing with a faulty radiator cap and what I thought was a head gasket going out! Turns out the cylinder threads for the headbolts were going south. Pressure frome the compression was entering the cooling system and over pressurizing it!

    The big sign I saw besides always running low on coolant was if it sat idling with the cap off it always had small air bubbles coming up to the top of the radiator!
  18. mountaincadre

    mountaincadre Been here awhile

    Joined:
    Jul 18, 2012
    Oddometer:
    478
    Location:
    Mid Calder,Scotland
    It was obviously a snake you were using.:rofl
  19. Superpacman13

    Superpacman13 Been here awhile

    Joined:
    Aug 6, 2011
    Oddometer:
    250
    Location:
    Springfield ORYGUN
    Mine vibrated loose. Loctite is your friend.
  20. GreyDawggg

    GreyDawggg Adventure seeker

    Joined:
    Aug 24, 2009
    Oddometer:
    464
    Location:
    Perth, Western Australia
    Thanks guys. I think it might be a similar case as low594 said. It was bubbling with the cap off. I have never had this happen before. I did try tighten the clamp as well as I could, thought it should have been tight enough. Sure hope it isn't a head gasket because I had that done with a new piston and cylinder less than 10k ago. I will find out more soon hopefully when I have free time. Cheers!