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  • Re: Misfires Module B

    by » 5 months ago


    Thanks Bill, and yes you are right about a totally unnecessary $1000 part.

    Enough for today.  I hope to go after it again tomorrow.  Old age is catching up with me and being retired, afternoon work no longer fits my lifestyle.......Tom


  • Re: Misfires Module B

    by » 5 months ago


    Well, it's with my hat in my hand and egg on my face that I write this.  I wanted everything back to original before moving on to examine the high voltage coils.  Somehow I got the connectors mixed up and had a devil of a time getting that straightened out, but I finally got it right.   Of course I test ran it to verify.  Someone posted a daunting Rotax ignition problem quite awhile back.  After many hours of troubleshooting, the end results were that he had replaced a bad spark plug with a new defective one, and it took them down the garden path.  Well, I guess I did the same thing.  I had another brand new full set that I was saving to install when I had it running properly, but I decided that it would be well worth $25 to just do it, even though I had already replaced all of the B side spark plugs once.  Well it ran like a top, and I actually was able to fly it today.  It was a lot of work and I learned a hard lesson, but  I did become quite familiar with the Rotax ignition system.

    Bill, my sincere apologies for my stupidity, even though some fault should be shared with my NGK supplier.  It was a pleasure working with you and comforting to have your guidance.  So Sorry for this, buy I sure am a happy camper...Tom 


    Thank you said by: RotaxOwner Admin, Bill Hertzel

  • Re: Misfires Module B

    by » 5 months ago


    I am Happy you have solved the problem.  laughing

    This thread will be beneficial for the next owner trying to troubleshoot his ignition system.

    I spent a lifetime troubleshooting electronics.

    What I learned is that 99% of the time it is something simple.

    It just takes a little Time, Effort And Thought to find the problem.

    "Shotgun" Troubleshooting is expensive and seldom finds the problem.

    That is why I cringe every time someone wants to "Throw Money at the Problem" and just start replacing parts blindly.

    I do not even consider a problem truly resolved until it can be recreated.

    You may very well have a bad plug; I am not doubting that,  but until you reinstall the "Bad Plug" in an "A" Lane position and the problem returns, it could just as well have been a marginal connection of a Spark Plug Connector that was resolved incidentally when the Plug was changed.

    - - -

    Whenever I eventually find an object that I lost,   After I find it, I sometimes keep searching.

    I tell people that I am still searching because "I didn't want it to be in the last place that I looked."  

    So I keep on searching after I find it because "You never know what else you may Find!"


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


  • Re: Misfires Module B

    by » 5 months ago


    Bill, I put all of the old plugs in my labled spark plug stand.  So, it will be easy to reinstall them in their original location, and I should be able to verify that the condition returns.  I will do that soon.  I would just like to fly for a few days first.  I'll let you know the results....Tom


  • Re: Misfires Module B

    by » 4 months ago


    Okay, popped off the cowl, swapped the old plugs back in, and experienced the same rough running on ignition B.  Has to be a bad spark plug.  Put the new ones back in and I all good again.  So, I pitched all 8 plugs, even though I am quite sure that it is probably just one that is bad.  I'm just done with the whole set, and I am taking no chances that I might be back there some day.  In fact, I had another set of old plugs and I pitched them as well. For $25/set, I'll just swap them in a set.  I have not been very successful in identifying a bad spark plug anyway.  Thanks for all your help............Tom


    Thank you said by: RotaxOwner Admin, Bill Hertzel

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