Another answer in addition to johns is that 90 % of plugs that fail fail with a short. The voltage travels either through a whisker of conductive trash between the electrodes, or down the side of the center electrode through condictive deposits to the shell. Not firing does not mean not getting voltage, nor does it mean that the plug is "open". Modern Fuel is so much cleaner than leaded garbage we tollerated for 3/4 century that plugsnow last 100,000 miles instead of 7500. They still foul in an oil burning tractor, but even then less than before. Jim
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Today's Featured Article - The Perfect Restoration - by Chris Pratt. Often, in quiet moments, I have wandered back in my thouhts to the many tractors I have seen over the years and wondered which one inspired me the most. Sure, we have a fond attachment to one brand and model or another, sometimes it was remembering that first time we got to climb up in the drivers seat and command that roaring beast, or maybe because when you see that special model, you can't help but see Dad on it, he's gone, but everytime you see a tractor like his, it's a like part of him i
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