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More about Spark Plugs

Spark plugs ignite the mixture in the cylinder. Wear or an incorrect heat range can cause misfires, poor starting, or reduced power.

Pay attention to heat range, electrode gap, thread, and whether the engine is standard, tuned, or turbocharged. With increased power, the correct spark plug becomes more important.

Check spark plugs regularly; they often reveal a lot about how an engine is running.