Well while waiting for John T to get on and answer, I will make a feeble attempt. On a coil/bat ignition system,I don't think it makes a diff as long as they are in good condition,in other words compare new to new. Now on a magneto ignition , which is probably what the posts you are referring to are talking about , there is no external power source feeding the coil and magnets have a finite amount of power that cannot ramp up just because a resistance is sensed as the other can. Therefore , any resistance between the mag and plug (including the plug itself) will affect the power to make spark. A coil/bat system has plenty of reserve and way more power than it needs to overcome resistance and actually make a hotter spark because of it. Not so with a magneto on the old tractors. A magneto on a nitro burning dragster was designed to fire a mixture of "syrup" and alcahol under extreme pressure conditions but these old tractor mags don't need and don't like resistance. I'm sure John "T" will chime in with the real answer.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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