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  1. #1
    Join Date
    May 2007
    Location
    Sth Gippsland Vic
    Posts
    4,355

    Default Stihl lead and plug question

    On my Stihl MS 661C .
    I take off my lead before taking out the spark plug and if I pull the lead out of the rubber boot the black rubber coated wire has a wire that is bent and has been speared / pushed through the rubber into the multi strand wire underneath. Where its speared / pushed in is on the other side of the black lead in the picture.

    This then gets pushed in the boot and comes into contact with the coil that sits in the boot . That coil is what slips over the end of the plug .

    Is that the way it is supposed to work ? Or has my wire that's speared into the side of the black lead broken of my coil ?
    And they somehow assemble the boot over the coil pushing it up the thin wire end opening as one piece ?

    I'm sure its been giving me running problems . I didn't realize there was a coil in the end for a while and assumed the wire should be seen when looking down into the boot before placing it on the end of the plug . Just a single wire roughly coming into contact with the plug end seemed a bit hit and miss.

    Getting the wire to sit behind the coil by feel and the coil slipped over the plug end by feel had it running great when I get it right . I'm not sure I get it right all the time though.

    IMG_0973.JPG

    Rob

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  3. #2
    Join Date
    Aug 2009
    Location
    East Warburton, Vic
    Posts
    1,604

    Default

    Its broken off, the rubber boot should stay on the lead, no need to pull the boot off the lead at all.
    Cheers

    DJ

  4. #3
    Join Date
    May 2007
    Location
    Sth Gippsland Vic
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    4,355

    Default

    Thanks Acco .

    I rang the Stihl shop near me a few days ago and asked them the same question and the guy told me he'd call back with an answer. The call never came back .

    I just went and looked on YouTube as well after seeing this and the answer is there too .

  5. #4
    Join Date
    May 2007
    Location
    Sth Gippsland Vic
    Posts
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    Default

    I went and got a new metal coil that fits in . Its not an exact Stihl one , the length is a little shorter .
    It should be working . But its not .

    My basic attempt at solving no spark .
    What I don't understand is , I put a meter (red lead) from my old car tune up kit on the lead , and the negative (black) on the head of the saw, and as I pulled it over I can see the needle reading a current with each pull .

    But with the plug on the lead and earthed to the head I cant get a spark .

    The ignition is on . As in the switch is down as if starting . I get a current reading with the meter but no spark.

    If I pull the switch as if the saw was just started and I was about to cut , same thing .

    And if I hold the switch up , as if to kill the motor . I still get a current reading ? With red lead on the wire or plug , black lead on the head ??


    There must be a lot better way to test this .

    I was also trying to get a spark jumping from the exposed wire at the end of the lead to the head by holding it close, spark plug out , switch on , still nothing .

    Spent hours trying and hope I can get it running without the cost of giving it to the shop .

  6. #5
    Join Date
    Apr 2006
    Location
    near Mackay
    Age
    59
    Posts
    4,628

    Default

    Have you tried another spark plug ?
    ​Brad.

  7. #6
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    27,756

    Default

    Kill switch problem? I've seen several variations of this.
    Once the switch was dirty so made poor contact and while there was enough juice to tickle my test meter it would not fire.
    I've also see kill switches on cheap saw installed backwards.

    Bypass the switch and see if you get a spark.

    BTW if you start it with kill switch removed you need a way to manually short the plug.

  8. #7
    Join Date
    May 2007
    Location
    Sth Gippsland Vic
    Posts
    4,355

    Default

    Quote Originally Posted by Ironwood View Post
    Have you tried another spark plug ?


    Yes . I tried a couple .

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