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Ignition

in 912 / 914 Technical Questions 9 years ago
Motor keeps running when both magnetos are switched off.

  • Re: Ignition

    by » 9 years ago

    Is this a brand new installation or an engine that has been running a while and this just popped up?


    Look at the back of the ignition switch connections and up at the two 6 pin connectors and make sure the two white wires are grounded from start to finish. Sounds like a broken connection at either end or possibly the two white wires have been rubbed and abraded and are now broken.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
    Report

  • Re: Ignition

    by » 9 years ago

    Its a long shot but one guy I know had the ignition wires connected to 12 volts! he misunderstood the system. He had to turn his master off to kill the engine.
      
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  • Re: Ignition

    by » 9 years ago

    To roger. The motor has done 138 hrs. Can't see any breaks in the 2 wires.
      
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  • Re: Ignition

    by » 9 years ago

    So I take it this just came out of no where and it has been working normal up to this point?
    Do you have separate switches or a rotary switch?
    If this was acting normally then all of a sudden you can't turn it off it has to be either the ignition switch or those wires have broken or have become disconnected somewhere.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
    Report

  • Re: Ignition

    by » 9 years ago

    roger, I just developed the same type problem.
    I have a 912 80horse and when I went to shut down, the engine actually "diesled" for three or for seconds.
    I restarted the engine and let it idle at 2000 for about thirty seconds, I shut off the master, then the two toggle switches for the the mags (CDI) simultaneously. The engine continued to sputter for a moment, then died.
    then I shut off the ignition at the key.

    I balanced the engine two days ago, it purrs like a kitten. the mechanical balance is good and I have an 1800 rpm idle at the stops. I did adjust the idle screws under the carbs but I will probable turn that back to the original today during troubleshooting.
    Any ideas?
      
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