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What is the spark plug gap need to be for a 4.5 hp yard machine?

The spark plug gap for a 4.5 hp Yard Machine should be set to 0.03 inches (0.76 mm). This gap ensures the spark plug creates a strong enough spark to ignite the fuel in the engine's combustion chamber, resulting in efficient engine operation. It's important to consult your specific engine manual or consult with a qualified technician to confirm the correct spark plug gap for your particular model.