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a detailed video on how to know the health of your engines by reading the spark plugs . in this video I walk you through removing the sparkplug from your engines with simple layman tools and analyzing the air-fuel mixture by looking for deposits that have formed on the sparkplug's tip (i.e the centre and ground electrodes). This video will be extremely helpful for those who want to know the overall health of their engines and want to keep it in good nick or want to save it from further damage.