Can you use a chapion cj7y spark plug to replace a dj7y spark plug?

While both the Champion CJ7Y and DJ7Y spark plugs are designed for small engines, they have different heat ranges and electrode designs. The CJ7Y is a hotter plug with a projected tip, while the DJ7Y is a cooler plug with a non-projected tip. It is not recommended to interchange them as it can affect engine performance and potentially cause damage. It's best to use the spark plug recommended by the manufacturer for optimal engine function.