Test it with a 1/4" gap, not a 1/16" gap. If it will jump a 1/4" and make a blue spark in free air, then you've got the 40,000 plus volts needed to fire a plug under compression in a fuel-air mix.
Electricity follows the easiest path to ground. When you tested with a 1/16" gap, it barely needed 30,000 volts to fire. When you hooked in the plug, it obviously called for higher voltage, and the electric charge ran elsewhere and out of sight. If you did the test inside a dark garage, you might see where it's making its way to ground. Usually impossible to see in daylight (but you might hear it). And there's also the remote possiblity that the plug has no continuity, or wire the same, and your coil cannot generate high enough voltage to travel through it.
That's why you test with a 1/4" gap. That, at least tells you there's more then enough voltage available to fire under most conditions.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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