gentlemen's:
This is my first post in your site after many months reading. I like the respect between members .


to Av8tor:
I am using with success coils from motorcycles like Honda XR 600 or Honda Transalp , brand names are "Nippondenso" or "Jtec". I am using in test firing a Jtec new coil at 4000 rpm aprox for more than 6 hour ( yes 6 , I have plenty of time ) in a test stand with a CDI scratch build with more than 500 volt in the primary of coil.
After I put a CDI in a test stand with a Homelite 38 cc chain saw engine modified to use in a Fokker I building and work more than 1 gallon of gas .very sweet start, with a handmade wood propeller.
You can use also old coil of motorcycles from repair shop, they survive motorcycles.I have a pair and work well
The lead of coil is screwed in the newer models , older is glued and you don't take out, I have both.
The coils have two pins on back they are inputs, the green collar is the positive pin , the black collar is the negative.
Chinese , japanese and taiwanese coils I have are the same color collars.
The coils are light to me , I do not even see a coil of Echo . Only stock chaisaws and old Ryobi.
They are rugged and whitstand abuse. I remove the lead from spark plug and let it spark free and no damage to insulation, after normalised and no problem.
Good leads come from discarded leads from real planes. I have a set of a Piper Tomahawk from my club. Make a contact with your local air field and meet with mechanic ,they have ever an old set in a junk box.
Good Luck.
Many thanks for the site
Jose