You might be surprised to realize you spark plug holes need cleaning - and yes some REALLY need cleaning! This 5-minute video will demonstrate Kent's method of cleaning the threads in the cylinder. In 30 to 50-year-old engines, these threads can really get gunked up with fuel varnish and combustion contamination. And nobody ever cleans the threads! Doing this when replacing your spark plugs will make it much easier to remove them in the future and prevent possible spark plug seizure.
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