What Is The Best Procedure For Changing Coolant In Ktm 640 Adv?

Discussion in 'Thumpers' started by DBGcooper, Oct 27, 2007.

  1. DBGcooper

    DBGcooper Flying Old Fart

    Joined:
    Mar 18, 2005
    Oddometer:
    66
    Location:
    Washington County-The other Maine
    Got a new 07 640 Adventure, and checked the coolant and found it to be good to only -10F, and it gets way colder up here. Unlike my KLR which has a drain screw at the lowest point under the water pump, I can find no such drain on this bike. I figured on pulling the lowest hose connetion on the front of the jug, but decided to throw this out in case there is a better way. Any help will be greatly appreciated. DBG
    #1
  2. Odysseus

    Odysseus Stoic Philosopher

    Joined:
    Jul 25, 2005
    Oddometer:
    4,161
    Location:
    Aurora, CO
    you guessed it the first time. Just remove the radiator cap and then pull the lowest coolant hose connection. The whole procedure is fairly painless. good luck!
    #2
  3. Adrian 8

    Adrian 8 Been here awhile

    Joined:
    Jan 10, 2006
    Oddometer:
    265
    Location:
    Memphis, Indiana
    I don't know about the 640 but my 450 KTM has a air bleed screw on the head near the sparkplug to drain the air out after you start filling it, plus there is an air bleed screw on the right radiator right up on top.
    #3
  4. meat popsicle

    meat popsicle Ignostic

    Joined:
    Feb 9, 2004
    Oddometer:
    14,552
    Location:
    Circumlocution Office of Little Dorrit
    I just changed my coolant; I ended up disconnecting a bunch of hoses and found that if I tipped the bike over (as far as I could) to one side and the other more would come out. Not sure why... maybe it helps drain the entire cooling system? :dunno

    When you refill it the manual says on page 36 for the 2003 model year to run the bike with the cap off for a bit to top off but you will have to check the coolant level spec (10mm above the radiator internals inside the cap) when engine is COLD. Here is a copy and paste:

    #4
  5. Odysseus

    Odysseus Stoic Philosopher

    Joined:
    Jul 25, 2005
    Oddometer:
    4,161
    Location:
    Aurora, CO
    Hey meat! :wave Thanks for adding your knowledge to this here thread.

    Also thanks alot for pissing off gaspipe and chasing him away. :lol3

    Jeez, all the LC4 gurus are dropping like flies, creeper doesn't even have one anymore, gaspipe is gone, loaded barely hangs out here anymore. Maybe when the new 690 Baja and Rally (or whatever they are going to call them) come out we'll have a big old LC4 revival. :kumbaya
    #5
  6. meat popsicle

    meat popsicle Ignostic

    Joined:
    Feb 9, 2004
    Oddometer:
    14,552
    Location:
    Circumlocution Office of Little Dorrit
    Hey Ody, :wave

    I pissed off gassy? :scratch What, where, when, why, how? Link?

    Well, it is the end of the model line so we should have this ole'LC4 business buttoned up soon. The new ones have silly pipes; I don't know...
    #6
  7. Odysseus

    Odysseus Stoic Philosopher

    Joined:
    Jul 25, 2005
    Oddometer:
    4,161
    Location:
    Aurora, CO
    I was just kidding about you being the guy who pissed him off. I thought you already knew about it.

    http://www.advrider.com/forums/showthread.php?t=279201



    As far as the new 690 hotness goes, me thinks I will hang on to the 640.

    Of course if they do start selling that bike they raced in the Baja 500, I will buy one immediately. :lol3
    #7
  8. rob748

    rob748 resident alien !!!!

    Joined:
    Jan 17, 2005
    Oddometer:
    825
    Location:
    traveling somewhere :)
    just wait for the water pump to fail and then refill :1drink ( after fixing the pump )
    #8
  9. meat popsicle

    meat popsicle Ignostic

    Joined:
    Feb 9, 2004
    Oddometer:
    14,552
    Location:
    Circumlocution Office of Little Dorrit
    Oh, I didn't know; thanks for the link. I had my chance to ride with him when I was temporarily in TN, but then he got busy and we passed like two ships in the night... no that's not it. :lol3

    Ah, the Baja KTM is sexy, but it wears its upswept pipes much better than these production 690 IMhO.
    #9
  10. ChrisC

    ChrisC Amal sex?

    Joined:
    Feb 25, 2003
    Oddometer:
    6,325
    Location:
    Prescott, Arizona USA Earth
    Well, not all of the original "LC4 Mafiosi" have departed... we've just gotten older and slower (save Hickson and his new Sherco addiction)... :wink:
    #10
  11. creeper

    creeper Still alive...

    Joined:
    Dec 13, 2003
    Oddometer:
    10,718
    Location:
    Puget Sound

    Mmmmmmm... Sherco. :lol3
    #11
  12. ChrisC

    ChrisC Amal sex?

    Joined:
    Feb 25, 2003
    Oddometer:
    6,325
    Location:
    Prescott, Arizona USA Earth
    Hey, ya ol' furt.... how's things?

    Had the Sherco "across the bridge" yet? :D
    #12
  13. creeper

    creeper Still alive...

    Joined:
    Dec 13, 2003
    Oddometer:
    10,718
    Location:
    Puget Sound
    Don't live in that part of Wooooshington any more... I'm further south than I was. Temps are freezing at night, so I'm sure some lucky bastard will get spit on their head going across it.

    My arms are so screw'd up that I haven't ridden the Sherco much. Boo fuckin' hoo huh? :cry

    I've got less than 10 hours on it... but hey, I did write a Sherco valve lash guide. :lol3

    Hi ho, hi ho...
    #13
  14. meat popsicle

    meat popsicle Ignostic

    Joined:
    Feb 9, 2004
    Oddometer:
    14,552
    Location:
    Circumlocution Office of Little Dorrit
    Pretty site. But I didn't see where to sign up for countless hours of bullshittin' :dunno
    #14
  15. rebelpacket

    rebelpacket four-stroke earth-saw

    Joined:
    Apr 12, 2009
    Oddometer:
    752
    Location:
    Missoula, MT
    I drained the coolant on my 625 the other day. :huh

    I must say, for a company famous for making not only fantastic bikes, but well-thought-out fantastic bikes, they really screwed the pooch on this one. I made a god-awful mess all over the bike, and had to tip it at ridiculous angles to try and get it all out. Even then, I'm not sure I did.

    What a crappy design. Compared to the RFS motors, its a big step backwards!
    #15
  16. fujian

    fujian Been here awhile

    Joined:
    May 6, 2010
    Oddometer:
    221
    Location:
    Langford ( Victoria ) British Columbia, Canada
    It's a strange way to drain I agree, but It seams to work for people.
    #16