No, you cannot directly replace a CJ7Y spark plug with a CJ8 spark plug. The CJ7Y and CJ8 are different spark plug models with variations in heat range, thread size, and reach. Using an incompatible spark plug can lead to improper combustion, engine misfires, and potential damage to the engine. It is crucial to use the correct spark plug recommended by the manufacturer for optimal engine performance.
Yes you can use a CJ8 for a CJ8Y, but you cannot use a CJ8Y for a CJ8......the CJ8Y has about 1/4in more thread.
Champion CJ8
Champion CJ8 is most popular
Cj8 is hotter than cj7
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.
A CJ8 Champion plug can be used with a 1974 lawn tractor that uses unleaded gas, however, it would be better to go with a hotter plug. The hotter plugs will keep the tractor running longer without needing to replace the plug sooner than expected.
You can use the following plugs for a cross reference for a Champion CJ8 Denso - W20M-U NGK - BM7A or BM6A (BM6A is a hotter plug than the BM7A) Bosch - WS9EC Autolite Part # 255
cj6y and cj7y are identical
Yes, a Champion CJ8 spark plug can replace a Champion RCJ6Y spark plug, as both plugs are designed for similar applications and have compatible dimensions. However, it's essential to check the specific requirements of your engine, such as heat range and thread length, to ensure optimal performance. Always consult your engine's manual for the manufacturer's recommendations before making a replacement.
.30
an rc8j resistor or a cj8y
CJ7Y works with no issues.