When any of small equipment fails, one of the first things we check is the spark plug. This article will show you guide on how to quick test a spark plug by multimeter.
A spark plug always has a number on it. This bad one is RC12 YC at the bottom.
The one we are going to using for replacement shows a different number here BK R5E.
But on the packaging it shows the RC12YC which matches the original number.
If you have a spark plug that has an
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