Fresno air erocoupe spark plug cups

[Patdevine]

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?

[Patdevine]

[LostnSpace]

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

[M Towsley]

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.

[M Towsley]

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

[Ragwing nut]

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

[lfries]

I should have the die. I get home tomorrow and will find it if your interested.

[Kerbs]

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/B01N35O7FA/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

[Patdevine]

Thanks!! I do appreciate it. Been off for awhile. Ended up going with slick conversion and cowl bumps.

[astjp2]

Rem37by plugs are 1/2” shorter than the E series plugs. Tim