Butom RC12YC Spark Plug replacement for Champion RC12YC — direct-fit for small engines, correct thread & heat range

Butom RC12YC is a direct-fit ignition spark plug engineered to replace Champion RC12YC and a wide range of OEM spark plug part numbers for small engines.

If your lawn mower, garden tractor, or small-engine equipment needs a reliable spark plug replacement, the Butom RC12YC offers the correct form and function for many popular machines. This plug is specified as a substitute for Champion RC12YC and compatible with several John Deere, Kohler, and other OEM part numbers, helping you restore consistent starting and operation when the original plug is worn or fouled.

Which original part numbers does this spark plug replace?

The Butom RC12YC is manufactured to match the thread, reach, and heat range common to the Champion RC12YC family so it fits interchangeably in equipment that accepts those specs. It lists compatibility with numerous OEM references to make cross-referencing easier when ordering parts.

• Direct replacement for Champion RC12YC and JD M78543
• Cross-references: BS 491055, 491055S, 692051, 792015, 72347GS, 805015, 499608, 491055T, 694385, 5066
• Kohler-compatible codes: 25 132 12-S, 25 132 12-A, 24 132 01-S, 12 132 02-S, 12 132 02, and 531308128

How do I confirm fit before I buy?

Always verify the model and part number of your equipment to ensure compatibility; physical dimensions and thread specifications vary between plugs. If you still have the original plug, compare its markings and measurements to the Butom RC12YC specifications or consult your equipment manual.

• Check the original plug’s stamped part number and heat range
• Confirm thread size and reach match your engine’s requirements
• Use listed OEM cross-reference numbers to validate compatibility

What performance can I expect from this replacement plug?

The Butom RC12YC is designed for dependable ignition and predictable operation comparable to the original Champion specification. It helps restore starting reliability and steady running when installed correctly in compatible engines.

• Restores factory-fit ignition characteristics when matched properly
• Supports consistent combustion and cranking performance
• Works across a range of small engines from lawn and garden equipment

How should I install and maintain the spark plug?

Installation is straightforward: remove the old plug, gap the new plug to the manufacturer’s recommended specification, and torque to the engine maker’s value. Routine inspection and replacement when fouled or worn keeps performance optimal.

• Set the electrode gap per your engine manual before installation
• Hand-start the thread, then tighten to the specified torque
• Inspect spark plug condition during seasonal service intervals

Who is this for: The Butom RC12YC is aimed at homeowners, landscapers, and small-engine technicians who need a reliable, cost-effective replacement for Champion RC12YC and equivalent OEM plugs. If you maintain lawn mowers, garden tractors, pressure washers, or other small engines that refer to the listed part numbers, this plug is a practical spare or service part to keep equipment running smoothly. Always match model numbers and thread specifications before installation to ensure proper fit and safe operation.