"ping" - "spark knock" - "preignition" - KLR

Discussion in 'Thumpers' started by TopJeff, Jun 19, 2007.

  1. TopJeff

    TopJeff Patriot Guard Rider!

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    Help!!

    Patient - '06 KLR 650 with 10,500 miles, idle screw out, fat (260LB rider)

    Problem - Spark knock occurs while rolling on the throttle heavily at any speed up to, and including 75 mph.

    Attempts - Seafoam, higher octane fuel - no results!

    What am I missing here?
    #1
  2. CA Stu

    CA Stu Peace and love

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    Check the tightness of the exhaust clamp nuts on the head. Sometimes they back you and you get the "tick" noise you are hearing.

    Also, check the mid-pipe joint and see if there's an exhaust leak there.

    As far as I know (:dunno) , the ignition timing on the KLR isn't adjustable, so its got to be mechanical rather than electrical...


    Thanks
    CA Stu
    #2
  3. ProblemChild

    ProblemChild Been here awhile

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    +1 on the loose exhaust clamp and system. Happened to me once.

    Also, have you checked the quality/gapping of your spark plug?
    #3
  4. TopJeff

    TopJeff Patriot Guard Rider!

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    Thanks for the help -will see if anything's lose!
    #4
  5. jfn68

    jfn68 Banned

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    Had a few klrs years ago,yep always had that knock when under load,nothing to worry about,those engines just refuse to die,still amazed how long my engine lasted.
    #5
  6. luckybum

    luckybum old n tard

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    I had a similar problem with my klr. It turned out that the intake manifold bolts had worked loose and it was running even leaner than normal.

    Luckybum
    #6
  7. MeefZah

    MeefZah Curmudgeonly Supporter

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    I'll be damned. I've been noticing this as well on my '06 / 17,000 miles, but just wrote it off...

    After reading the thread I checked my header bolts and they were loose; the non-radiator side one was about a turn loose and the radiator side about 1/2 turn loose. In fact, by grabbing the header and shaking it, I could feel and hear a rattle between the engine and pipe. The mid pipe joint bolt was abotu 1/2 turn loose, too. Tightened 'em up, I did.

    Thanks CAStu! :thumb
    #7
  8. CA Stu

    CA Stu Peace and love

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    :ilmostro

    De nada.

    Thanks
    CA Stu
    #8
  9. TopJeff

    TopJeff Patriot Guard Rider!

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    Found the head bolts a little loose!

    Found the mid-pipe a little loose!

    Still pings under a load!

    Somebody mentioned plug - how long does everybody run theirs? I thought for sure with CDI ignition I would gt 2 years out of a spark plug!
    #9
  10. CA Stu

    CA Stu Peace and love

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    Check the valves? 10,500 miles should have had 2 valve checks already...

    Thanks
    CA Stu

    PS what rpm do you get pinging at?
    #10
  11. TopJeff

    TopJeff Patriot Guard Rider!

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    Valve check due at 12K miles! Thought about that too. Soon!

    Happens at all RPMs, any gear.

    Does not do it if I roll on the throttle easy - only when I grab a fist full!
    #11
  12. CA Stu

    CA Stu Peace and love

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    Do you have an aftermarket pipe?
    Have you re-jetted the carb?
    Shimmed the needle, replaced the main jet?
    When you are on the gas hard, the main jet comes into play more than the idle circuit: read this:
    http://members.aol.com/roundr1/CVK40.html

    If it was my bike, here's what I would do: Check the valves now, set them to the loose end of spec, replace the spark plug, see what happens.

    Thanks
    CA Stu
    #12
  13. dminded

    dminded Been here awhile

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    I think that is actually pretty normal for klrs under big loads. It'll lug all day, but try to roll on the throttle while lugging andyou'll get spark knock. You just need to keep your rpms higher and you'll be fine. Also, try some higher octane/ethanol free gas.
    #13
  14. CA Stu

    CA Stu Peace and love

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    That's a good point, what rpm are you getting this knock?

    Thanks
    CA Stu
    #14
  15. TopJeff

    TopJeff Patriot Guard Rider!

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    It happnes as high as 5500-6000 or so!

    You're probably on the money with doing the valves early and changing the plug. Probably a next weekend thing.
    #15
  16. kawalaser

    kawalaser Hip to be square

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    Foolish question: how do you recognize knock/ping under heavy throttle in a high gear. I get a sort of bogging sensation but attribute this to the underpowed engine. 05 w/ 900miles.

    Is it knocking?
    #16
  17. crazyal

    crazyal God save the triple

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    I had this problem as well. I found it started after I ran the bike out of fuel. So I put a filter in and cleaned the carb., changed the plug. Problem gone I think I may have picked up some shiit in one of the jets.
    My 2 cents
    #17