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Briggs & Stratton 491055 → 491055S
Briggs & Stratton resistor spark plug. OEM store text lists
491055S as replacing older
491055, 805015,
594056, 72347 / 72347GS.
| Field | Value |
|---|---|
| Current OEM | 491055S |
| Common cross | Champion RC12YC class (verify before substituting) |
| Typical gap (Briggs FAQ row) | 0.030" for the RC12YC-replacement resistor row |
| Related OEM | 692051 also listed as RC12YC replacement on some Vanguard rows — not automatic for every 491055S engine |