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The new 912ULS have the new spark plugs and spark plug covers. If I want to replace the new style spark plugs with the older NGK I have been using for decades, do I need new/old spark plug covers rotax 265-240 or can I use the new style spark plug covers (for the new spark plugs) with the old/standard NGK spark plugs? 

  • Re: Spark plug covers for new engines/spark plugs with NGK plugs

    by » 2 years ago


    The new covers/boots will work with NGK plugs.  Both plug types have the same threaded stud terminal and both plugs are resistor type.  The boots are also resistor type, and the new and old boots have the same resistance.  That being said, it’s unclear to me what Rotax’s stance is regarding going backwards on an engine equipped from the factory with the new style plugs.  The Service Letter states that you are not required to up-fit older engines, but going back to the old plugs on a new engine is not specifically addressed.  I have to believe they would discourage it, but many are doing it.  

    I had the old style boots, and last year I lost one to heat damage and upgraded all eight boots to the new style along with new wires.  They are not cheap, but I do believe they are better.  They are silicone so they should hold up to heat longer, plus the 90 degree form factor tucks them in better.  I’m still running the NGK plugs.  


    Thank you said by: Paul Hamilton

  • Re: Spark plug covers for new engines/spark plugs with NGK plugs

    by » 2 years ago


    New plug caps will work with NGK's.


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


    Thank you said by: Paul Hamilton

  • Re: Spark plug covers for new engines/spark plugs with NGK plugs

    by » 2 years ago


    Thanks both. I had to ask because someone told me when they went to the new spark plugs (to solve a carb problem it was eventually diagnosed), they had to upgrade to the new caps. So again, barking up the wrong tree.

     


  • Re: Spark plug covers for new engines/spark plugs with NGK plugs

    by » 4 weeks ago


    Hi Roger, I’m doing my annual and I did my compression checks and noticed that my number two cylinder spark plug caps were loose and they don’t really clip on as tight as the rest with the ratcheting sound and force! and they’re easy to pull off in comparison to the other three cylinders, what caps would I use to replace my spark plug caps? , i’m concerned I’m not getting a solid connection at this point  , However, there’s no issues on my Meg checks after start up ,,.? thanks John,


  • Re: Spark plug covers for new engines/spark plugs with NGK plugs

    by » 4 weeks ago


    Do not mix different types of plug caps. If you don't have a new engine then they are probably this one.

     Ngk 8425 Vd05Fmh 


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


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