9 Symptoms of a Bad Motorcycle Spark Plug (That Will Cost You Thousands)

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9 Symptoms of a Bad Motorcycle Spark Plug (That Will Cost You Thousands)

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Did you know that one bad spark plug can add up to 30% more fuel use and destroy your catalytic converter?
What is a spark plug? Today, I’m going to share 9 symptoms of a bad spark plug.
So, what’s a spark plug? It’s the match for every burn—a tiny igniter that turns coil voltage, often 20,000–40,000 volts, into a spark that lights the mix thousands of times per minute.
Whether your bike’s carbureted or fuel-injected, single or inline-four—doesn’t matter. Plugs sit deep in the head, one per cylinder, and fire every power stroke.
Let’s dive into the 9 tell-tale signs your plug is dying—before it wastes fuel, power, and time.
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