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Briggs and Stratton engine problems

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I have a 13 horse power Briggs and Stratton engine in my Simplicity 7130. It has a new sparkplug in it, and the engine turns but it doesn't fire. The plug does seem to make a spark, but the engine just wont fire. I've tried using ether, but it doesnt work. Any ideas about what's going on? I need all the help you guys have. Thanks.

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Is the magneto-air gap correct? I had a 16HP, had problems, would sometimes fire, ran really poor when it did run. It turns out the magneto gap was wrong, the head was warped, and it needed a valve job.

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Brian usually when we get one like that here in the shop it turns out to be the ignition coil. Most small engines since the mid 80's have the "electronic" ignition built into the coil instead of "points and condensor". For some reason there seems to be a rash of bad coil packs lately, even in units only a few months old.

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