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 - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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