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Why do Harley Davidson Spark Plugs fire on the exhaust stroke? To burn up unused gasoline. That's what Catalytic Converters do too... The UNUSED GASOLINE passes through a Platinum screen on the way out the exhaust. The heat and catalyst finished burning up the UNUSED gasoline so the exhaust pipe doesn't spit out UNUSED gasoline into the air. UNUSED, UNUSED, UNUSED...
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