RC12YC Spark Plug for Brigg 491055T 491055S 491055 692051 792015 kohler 12 132 02-S Champion RC12YC Spark Plug (2 PACK)

What It Is

The RC12YC spark plug ignites the air-fuel mixture in small engines, designed for push mowers, riding mowers, and generators using Briggs & Stratton or Kohler engines. This 2-pack provides a direct replacement for OEM part numbers 491055T, 491055S, 491055, 692051, 792015, and Kohler 12 132 02-S.

Fitment & Compatibility

• Cross-reference: Fits Briggs & Stratton (491055T, 491055S, 491055, 692051, 792015) and Kohler (12 132 02-S) engines. Also replaces Champion RC12YC.
• Measurements: 14mm thread diameter, 19mm (3/4") reach, 13/16" hex size, gasket seat, gap 0.030" (pre-set, but verify).
• Check: Confirm your engine model number (stamped on valve cover or blower housing). Not for side-valve Briggs engines using a different heat range. Deck size irrelevant—fit depends on engine, not mower deck.

Key Things to Know

• Quality: Copper-core, single-electrode—reliable for standard-duty use. Not iridium or platinum; replace every 100 hours or annually.
• Installation: Lightly hand-tighten, then 1/2 turn with a wrench. Overtightening can crack porcelain or strip threads.
• Gotchas: Pre-gapped, but always check with a feeler gauge—0.030" is critical for proper ignition. Use anti-seize on threads for aluminum heads.
• Pack: Two plugs saves time on twin-cylinder engines or gives you a spare.

Should You Buy It

Yes, if you need a direct, budget-friendly replacement for a Briggs or Kohler engine requiring RC12YC spec. Fine for standard mowers and generators, but skip if you prefer long-life iridium plugs or need a different heat range for high-performance use.