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Q: Are champion rc12yc and rc12yx spark plugs interchangeable?
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Are Champion spark plugs RC12YC and RC12YC5 interchangeable?

I was wondering the same thing this afternoon


Is rc12yx the same as rc12yc in spark plugs?

I found lots of replacements for the Champion rc12yc but none for the yx. Are they the same spark plug? Why wouldn't anyone carry a spark plug for a lawn mower that's two years old?


Is the RC12YC the same as the RC12YX spark plug?

Not really, but that is the only plug Sears sells as a substitute. The RC12YC plug looks like it was designed for a gap of 0.035-0.040", while the RC12YX plug was clearly designed for the recommended 0.020" gap. The RC12YC electrode is a fat cylinder like most spark plugs, while the electrode of the RC12YX is cut down to about half of the diameter. I'd guess the special RC12YX makes it easier to start the engine on a single pull.


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The Champion spark plug rj19lmc should be able to replace j19lm. Many of Champions spark plugs are interchangeable with plugs with the same letter coding.


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Is the RC12YC the same as the QC12YC spark plug?

Both are resistive type plugs. The "R" indicates a resistor plug and the "Q" a EMS (electromagnetic suppression) resistor plug used to reduce noise in sensitive digital electronic circuits. In automotive uses Champion lists some Saab's requiring this "Q" plug. Lawn and garden small engines substituting to the RC12YC plug works just fine. In fact Sears will send you the RC12YC as a OEM part even though the engine was shipped with QC12YC plugs.


What is the right gap for rc12yc plugs used in edelbrock heads with high out put coil and wires?

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