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This replacement rocker arm is a genuine OEM part for a wide range of appliances that include log splitters, walk-behind mowers, blowers, and tillers. A rocker arm, also known as a reciprocating lever, translates rotational movement into a linear up and down motion. This particular rocker arm is attached to the exhaust valve, meaning that this lever is responsible for opening and closing the exhaust vent. As rocker arms receive motion from another part, the two parts rub together and create friction. Over time, the rocker arm will wear out, and no longer create a snug fit at the connection. This will cause exhaust to get trapped in the engine and create backfires. To replace the rocker arm, remove the valve cover using a socket wrench, take out the spark plug, then pull the pin out of the old rocker arm and reassemble with a new part. This replacement rocker arm is a high-quality part sourced from its original manufacturer and is suitable for Cub Cadet and MTD engines. This shipment does not include any of the hardware required for assembly and ships individually.