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Old 09-17-2015, 03:40 PM   #1
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Briggs and Stratton no spark

I have an old (70s ish) 3.0 HP Briggs and Stratton lawn mower engine that won't start. It ran a few years ago then sat in a garage for a couple of years. In all my troubleshooting the biggest problem seems to be there is no spark.

I take the spark plug out, hold it against the block and pull the cord but don't see any spark. Got a new spark plug and still no spark. If I touch the metal of the spark plug wire while pulling I can feel a jolt. Not a painful zolt, but enough that I know electricity is coming across.

Could it be there is not enough electricity coming from the coil? Why would that be? I had it apart and didn't see anything that looked wrong? What do you think I can try next?

Thanks. -Tom
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Old 09-17-2015, 03:51 PM   #2
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Coils go bad, spark plugs need changing. I replaced the coil on my 20+Lawnboy because it would die after 10 minutes of running. Runs like a clock.
"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety."
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Old 09-17-2015, 03:53 PM   #3
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Using the old plug, close the gap down to about 0.005" and test for spark in dim light or after dark. If there is a faint yellow spark the coil is often the culprit. Why? They just do that to us occasionally. But never say always on one of those things.
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Old 09-17-2015, 05:13 PM   #4
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70ish? It likely has points. They can corrode.

Pull the flywheel and clean them up.
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