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Is your 40cc engine losing its spark Our spark plug for 40cc 4-stroke ATV, dirt bike, and mini bike engines is a very good one to use as a replacement for a broken, damaged, burned-out, or missing spark plug Is your 40cc engine losing its spark Our spark plug for 40cc 4-stroke ATV, dirt bike, and mini bike engines is a very good one to use as a replacement for a broken, damaged, burned-out, or missing spark plug. Spark plugs are one of the most common causes of electrical failure in a gas engine. Before potentially wasting money on other more expensive gas engine parts, consider replacing your old spark plug instead.