What's The Lifespan Of An Iridium Spark Plug? The average, modern iridium spark plug should last for 3-4,000 hours of engine uptime, depending on the gas quality. Each make and brand of spark plug should come with its own estimated rating for hours of use without degradation or failure.
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Orange and yellow come from particles of sodium in the air ionizing in the high energy of the spark gap. However, they are talking about small air cooled engines, and are using a specific Briggs and Stratton spark tester with a fixed gap for small air cooled engines, the 19368 model.