What is the difference between these two plugs besides the groove in the electrode? The 9 tells me that the heat range is the same...why do I need to spend extra to replace the 'S' with a 'YA'??
The EYA is a "anti-fouling" plug. I use the EYA's in my ZRT6 and haven't fouled a plug since. Whether they are a resistor or non-resistor type plug, I am not sure.
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