2 Pack RC12YC Spark Plug for Briggs and Stratton 491055S 491055T 491055 692051 792015 for Kohler 12 132 02-S for Champion RC12YC Spark Plugs

What It Is

This is a 2-pack of RC12YC spark plugs, designed for small engines in lawn mowers, tractors, generators, and pressure washers. It replaces common OEM part numbers from Briggs & Stratton, Kohler, and Champion.

Fitment & Compatibility

Before buying, confirm your engine uses a 14mm thread size, 19mm (3/4") reach, and a gasket seat. This plug fits most Briggs & Stratton engines (models with 491055S, 491055T, 491055, 692051, 792015) and Kohler engines (part 12 132 02-S). It also directly replaces Champion RC12YC. Check your owner’s manual or pull the old plug—if it has the same thread diameter, length, and a flat washer-style seat, it’s compatible. Avoid using in engines requiring a tapered seat or shorter/reach plugs.

Key Things to Know

• Quality: These are standard copper-core plugs—good for reliable ignition but not as long-lasting as iridium or platinum. Expect 25–50 hours of use before replacement.
• Installation: Easy—remove the spark plug wire, unscrew the old plug with a 5/8" socket, gap the new plug to 0.030" (check with a feeler gauge), and hand-tighten plus 1/2 turn. Over-tightening can strip threads.
• Common gotcha: Don’t assume “RC12YC” is universal—some engines need a resistor-type plug (this is resistor). Verify your old plug has an “R” in its number. If not, this may cause misfire.
• 2-pack value: Handy for two mowers or as a spare, but if you only need one, check if a single is cheaper.

Should You Buy It

If you have a Briggs & Stratton or Kohler engine that specifies RC12YC, this 2-pack is a solid, budget-friendly choice for routine maintenance. It’s not premium, but it’s correct for most standard lawn mowers, generators, and small engines. Skip it if you need a long-life plug or a different reach/thread size.