I had a problem with hard starting and one cylinder misfiring under heavy load on a B&S 17 hp boxer engine.
The thing was miserable cold starting, I had to keep the throttle closed to keep the cylinder pressure low and choke until it would idle off. Once running, it would miss on one cylinder under a heavy load. I changed plugs several times, (tried different brands and heat ranges) with no fix for the problem. I thought it had to be a weak mag coil, so I replaced that, but gained nothing. I suspect now that the flywheel magnets are weak, leading to the weak spark.(coil gap is correct)
I had plug fouling problems with a couple little 2 cycle engines, that were fixed by installing E3 brand lawn and garden plugs. I only tried them because of their guarntee that they would not foul, suspecting that they were just another non working gadget. I was wrong (happily :-) they cured the 2 cycle starting and fouling problems. I thought, they worked so well in the little 2 cycle motors, why not try them in that cranky B&S four cycle. I installed E3 plugs in it and immediatly saw a dramatic difference, I could now cold start it with the throttle open, allowing full cylinder pressure, and it started in the first few turns of the engine. The heavy load misfire on one cylinder is also gone. That set of plugs is in there for 5 seasons of mowing the lawn, still starts and pulls great.
In the case of the E3 plugs, their really are magic sparkplugs, that will in part compensate for a weak ignition system or some engine wear caused fouling. They might be worth a try, they work for me. :-)
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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