Mower works great after replacement. The packaging and plug look like a real RC12YC Champion spark plug. Read some testimonials from people who say it doesn't work for their lawn mower that needs this type of fork. I believe the problem may be that the spark plug is not set to the correct gap for the application. Consult the user manual and set the correct distance. A spark gap tool is very inexpensive. I had to adjust the clearance slightly to the recommended 0.030". Even if the distance has been preset, the distance may change during transportation, etc. This should work for any small engine that requires an RC12YC spark plug.
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