How to inspect the valves on a KTM LC4 In three easy steps.

Discussion in 'Thumpers' started by creeper, Oct 8, 2004.

  1. lauris47

    lauris47 Adventurer

    Joined:
    Jun 20, 2016
    Oddometer:
    74
    Location:
    Denmark
    Does this sound like bad clearance of valves to you guys?
    Sound does not disappear on higher rpms.
  2. javahitman

    javahitman Been here awhile

    Joined:
    Mar 19, 2014
    Oddometer:
    241
    Location:
    Melbourne AU
    i think it sounds more like bearing.
    but check the valve clearance first anyway as its probably the simplest thing to do at this stage anyway.
    then you might want to take the rocker cover off and inspect rocker arm bearings and other components while there

    also does it sound the same when in gear and during riding ?
    can you tell if the sound coming from the top of the engine or clutch side ? it could be cllutch too.
    also post it to 640 Index thread, there will be more people looking at it.
    and post more details about the bike what Year, how many KMs etc.
  3. Queen of Spades

    Queen of Spades tall drink of water

    Joined:
    Mar 20, 2009
    Oddometer:
    1,934
    Location:
    Decatur, GA
    That sounds like something other than valve lash to me.
  4. lauris47

    lauris47 Adventurer

    Joined:
    Jun 20, 2016
    Oddometer:
    74
    Location:
    Denmark
    It's after rebuilt of broken cam chain, sprocket change etc.

  5. javahitman

    javahitman Been here awhile

    Joined:
    Mar 19, 2014
    Oddometer:
    241
    Location:
    Melbourne AU
    can it be the cam chain slapping inside ?
    have you checked the chain tensioner
  6. lauris47

    lauris47 Adventurer

    Joined:
    Jun 20, 2016
    Oddometer:
    74
    Location:
    Denmark
    Cam chain is tensioned and in place.
  7. meat popsicle

    meat popsicle Ignostic

    Joined:
    Feb 9, 2004
    Oddometer:
    14,565
    Location:
    Circumlocution Office of Little Dorrit
    Just did my valves - mileage approaching 30k:

    intake valves were a tight 5; exhaust were more than a loose 7 - probably 0.008 (dang I just realized I should have checked with the other end of the feeler gauge... dork). I adjusted the exhaust valves to at least a loose 7; really hate claiming I nailed the 6. I left the intakes at tight 5s. The bike fired up like it appreciated the attention - just my imagination or do slightly loose exhaust valves play that much of a role?
  8. N3il.H

    N3il.H Adventurer

    Joined:
    Jun 2, 2018
    Oddometer:
    27
    Location:
    Plymouth UK
    So I did mine the other day! Sad to say I didn't follow this guide and for sure I did it wrong! As I know have a very tappety engine. So that was 3hrs of my life wasted, owell practice makes perfect lol

    Now iv read this guide hopefully I won't get it wrong.
  9. lauris47

    lauris47 Adventurer

    Joined:
    Jun 20, 2016
    Oddometer:
    74
    Location:
    Denmark

    Make sure engine is in the right TDC, piston can be at the top twice, but only at one place it is correct . To be sure you are in TDC Lock the cranshaft with cranshaft locking bolt or view trough the sign glass for the little mark on the flywheel, which indicates TDC. I never like the straw method, but what Ive mentioned always worked for me.