According to an old Champion catalog:
2nd Prefix: R = resistor, or U = auxiliary gap, X = resistor as well
1st Prefix: N = 14mm thread, 3/4"reach, 13/16 hex
Basic Number: 1 to 25 = automotive, small engine, ordnance
1st or 2nd Suffix: Y = projected core nose or C = copper-cored center
electrode
Best
Peter
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