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Is the RC12YC the same as the QC12YC spark plug? - Answers
Nov 29, 2024 · The RC12YC and QC12YC spark plugs are similar but not exactly the same. Both are designed for small engines and have the same 14mm thread diameter and 3/4" reach. …
Is the RC12YC the same as the RC12YX spark plug? - Answers
Mar 31, 2025 · Both are designed for small engines and have the same 14mm thread diameter and 3/4" reach. However, the RC12YC has a copper core electrode while the QC12YC …