Jim:
I have never seen a video of a spark plug in action but years ago I bought
a clear plastic plug that came in a kit and was supposed to let you see the
mixture in the cylinder as it burned. There was a chart the showed
different colors and indicated if your mixture was too rich or too lean. It
was really neat to watch the spark but the thing broke in the spark plug
hole when I went to remove it. Heck of a time to get it out. Can't remember
if it told me anything or not. Anybody else remember these?
Godspeed
Jc
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