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Ignition charging coils

in 912 / 914 Technical Questions 7 years ago
Does anybody know the failure mode of the ignition charging coils on a 912?
We have an intermittent starting issue and the cdi boxes are tested and fine. Cranking speed is over 300 rpm. The only out of spec is the charging coils that both have 4.8 ohm resistance. 0.3 ohms above spec.
Is it possible for these coils fail with resistance slowly increasing with age?

Thanks
Tony

  • Re: Ignition charging coils

    by » 7 years ago

    Hi Tony,

    The coils rarely ever fail. They are fairly bullet proof. Before I condemned a coil I would be 100% sure it isn't plugs, plug cap, plug wires or just a bad wire crimp or connection at the ignition module 6 pin connectors.
    I have had people swear it wa some thing exotic and it was only too wide plug gap. Make sure everything like plug gaps are correct and it could even be a fuel delivery issue and or starting technique issue.

    Coils are extremely rare to be bad before any of these.

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

    Thank you said by: Tony Webster
      
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  • Re: Ignition charging coils

    by » 7 years ago

    Thanks Roger
      
    Report

  • Re: Ignition charging coils

    by » 4 years ago

    Just received a Dr. Rotech diagnostic tool and it tells me that circuit B charging coil has failed. I would like to know what it calls 'failed'.  Is it shorted, open or grounded? Can I find the resistance value somewhere for these coils. From I hear these coils are robust and rarely fail.  I may have an open circuit but I would like to measure the resistance before I have to pull the stator.  Any advice is welcomed.

    Tim O'Donnell

    Stemme S10vt/914

     

      
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