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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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