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Old 08-03-2017, 09:47 PM   #1
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spark plug tester


When using a spark plug tester, did it after dark to get a better look, the spark is red. Shouldn't it be blue or yellow if it is getting enough fire?
I took the mower over to my daughters for her to use. It started easy. After sitting for a couple weeks, it won't start at all now.
Put in a new spark plug, no difference. Wondering if it got wet and the mag is rusted.
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Old 08-04-2017, 05:29 AM   #2
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Re: spark plug tester


Yes, blue is what you want, and, especially if you suspect that it may have gotten wet, I would start by cleaning it up a bit with either a wire brush or emery cloth. Doesn't need to be perfect. While you're in there, check the flywheel key to make sure it's not bent, and gap the coil at about the thickness of a business card.
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Old 08-04-2017, 05:31 AM   #3
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Re: spark plug tester


Taking DexterII's comments further, make sure the flywheel magnets and pick ups are clean. Emery cloth the contact areas and the pick up to ensure a good spark.
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Old 08-04-2017, 05:47 AM   #4
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Re: spark plug tester


It is my understanding that the spark "color" is a bit of a myth. Seems like the air cooled engines will show more orange in color whereas the automotive sparks will (based on the voltage type and other factors) look more "blue".

If you are seeing spark, I am going to suspect it is something else other than the magneto.
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Old 08-04-2017, 05:52 AM   #5
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Re: spark plug tester


Runs well and all of a sudden does not run at all because of yellow spark often indicates a new coil being in order. When you pull the shroud to look at the coil don't be surprised if you find a mouse nest. That's a favorite for those little fellers.
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