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Fresno air erocoupe spark plug cups

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  • Fresno air erocoupe spark plug cups

    Just got my magneto kit from slick. Imagine my disappointment when plug cup threads don’t match ignition lead. Any ideas other than return cups install cowl bumps?

  • #2
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    • #3
      Try doing a search for cutting threads to match, it's been several years, i went thru the same thing, someone on this site had the die that I borrowed and paid shipping to cut the proper threads, put it in a 4 jaw chuck and turned down the major diameter, seems like he was in California, but don't remember his name

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      • #4
        It is covered on here. Someone had a die I used. Too many years ago for me to remember but I think I covered some of it in my post.
        Cheers,
        Marty


        TF #596
        1946 BC-12D N95258
        Former owner of:
        1946 BC-12D/N95275
        1943 L-2B/N3113S

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        • #5
          Use the search tool, it is better than waiting for answers we have repeated many times. Here is one of my posts: https://vb.taylorcraft.org/forum/tay...t=ercoupe+cups
          Cheers,
          Marty


          TF #596
          1946 BC-12D N95258
          Former owner of:
          1946 BC-12D/N95275
          1943 L-2B/N3113S

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          • #6
            Its the same thread and nut as on the old style magneto end that still has the screw on leads.

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            • #7
              I should have the die. I get home tomorrow and will find it if your interested.
              L Fries
              N96718
              TF#110

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              • #8
                Here is a link to the die that I used. I was able to sand down the old threads by hand and then when smooth, use this to turn them to the correct pitch. I also had to take a small round file and clean up some of the welds on the neck of the cup so that the harness ends would seat deep enough.

                https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
                Stu

                '46 BC12D
                Jefferson County (0S9)

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