A bad plug right out of the box, can not be anything but a shoddy bit of junk. For engines that foul with one brand of plug, but not with another with both supposed to be the same heat range ? The way it was explained to me by a spark plug co "expert", he said that a different brand plug may actually be several hundred degrees hotter or cooler than another brand in the same HEAT RANGE. If your engine and how you use it favors a slightly hotter or cooler plug, then your engine will "like brand A, but not brand B. The same or another engine used under different conditions, may "like" brand B better than brand A in that situation.
Some years ago, my lawn / garden stuff had some problems a Ryobi string trimmer and Ryobi leaf blower, both were bad for fouling plugs. I tried Autolite,Champion, AC, NGK, none helped the fouling problem. About that time the E3 spark plug bubble pack caught my eye, as they advertised gaurnteed, never a fouled plug. I tried them and yes, they never foul in those two Ryobi rigs. Have been in them for 5 years. Another problem was my bought used rider mower with a 16 hp Briggs opposed twin. This engine was always very hard starting, had to nurse it to life with the throttle closed, then slowly increase rpm and open the choke. I thought it had to have a bad coil as the spark was weak. I replaced the coil with no improvement. I now suspect weak flywheel magnets. This engine will also miss on one cylinder when heavily loaded. I tried several different common brands of plugs with no improvement. I thought, the E3"s worked so well on the 2 cycle plug fouling problem, might they also help that old Briggs twin ??. I installed E3 plugs and saw night and day difference. I can flip the throttle open, pull the choke and it lights off easily, instead of having to nurse it to life at idle. Also the heavy load misfire is gone. That convinced me that not all the "fancy" plug designs are just hogwash, the E3"s really work for me.:-)
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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