KTM 640 help needed

Discussion in 'Thumpers' started by SCsurfer, Feb 23, 2013.

  1. SCsurfer

    SCsurfer surfing explorer

    Joined:
    Sep 3, 2007
    Oddometer:
    171
    Location:
    San Clemente
    Doing some prep for Baja and noticed milkey residue in the crank case breather
    tube. No signs of this in the oil level sight glass or the valve drive as I was doing a valve check in prep for the trip.
    The bike is an '07 with 18k and I replaced the cam rollers and water pump seals about 2k miles ago .
    Any input would be greatly appriciated.
    #1
  2. CSF

    CSF Been here awhile

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    Ontario, Canada
    It may just be some condensation build up? Although you might have some leaking gaskets,and there should be signs of that in the oil and the color of the exhaust smoke... very very white, like the engine is burning some water... just a guess.
    #2
  3. SCsurfer

    SCsurfer surfing explorer

    Joined:
    Sep 3, 2007
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    San Clemente
    Exhaust output is the same as when I bought the bike new .
    #3
  4. gunnerbuck

    gunnerbuck Island Hopper

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    Like CSF mentioned, it is not unusual to get a snot buildup in the pipe from condensation... I find that the build up is worse in the winter due to cooler temperatures and where I live, damper conditions...

    If you only have 2K on a rebuilt pump you should be good for a while, as long as you used the correct double lip pump seal...
    #4
  5. CSF

    CSF Been here awhile

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    Ontario, Canada
    If the exhaust is the same, its probably just condensation build up. Nothing to really worry about in that case. But just to be sure I'd drain the oil and remove filters. Inspect the oil for any contamination, if there is no evidence of anything in your oil then clean the gunk out and put fresh filters and oil in. Wait and see if the gunk comes back.
    #5
  6. SCsurfer

    SCsurfer surfing explorer

    Joined:
    Sep 3, 2007
    Oddometer:
    171
    Location:
    San Clemente
    CSF and gunner,
    Thanks for your input. Changed the oil and filters last night. No signs contamination.
    #6
  7. bmwktmbill

    bmwktmbill Traveler

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    5,284
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    Surfer,
    Wish I was going to Baja!!

    Watch your coolant level for sure.
    Pack a couple of replacement water pump seals and a spare head gasket.
    Just in case?

    Well that's what I'd do.
    (And a headgasket is always a nice thing to have, protect it with cardboard, etc.)
    bill
    #7