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Champion Spark Plug (RC12YC). The spark plug ignites the fuel and air mixture in the cylinder to power the engine. If the spark plug is burnt, fouled or damaged the engine may not start or may run rough.

NGK spark plug. The spark plug ignites the fuel and air mixture in the cylinder to power the engine. If the spark plug is burnt, fouled or damaged the engine may not start or may run rough.

Small engine Champion spark plug (RJ19LM). If the engine does not start, the spark plug may be defective. The spark plug should be replaced periodically during regular maintenance.

MTD Spark Plug. The spark plug ignites the fuel and air mixture in the cylinder to power the engine. If the spark plug is burnt, fouled or damaged the engine may not start or may run rough.

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A fouled or worn spark plug is one of the most common reasons your Yard-Man mower won't start or runs rough mid-season. The good news: spark plugs are one of the easiest and cheapest fixes you can make yourself. We stock genuine OEM spark plugs, boots, and wires engineered for your specific Yard-Man engine to deliver reliable ignition every time you pull the cord.
Delayed starting, sputtering under load, or weak performance? These are classic signs your plug needs replacing. Most mowers need a fresh spark plug every season or two, depending on use. Grab the right part now and get back to mowing today.
The safest way is to locate your mower's model number (usually stamped on the frame or under the seat) and enter it in our parts finder. We'll match you with the exact OEM spark plug for your engine. Alternatively, check your owner's manual for the recommended plug type and gap specification.
Fouling happens when carbon builds up or fuel floods the combustion chamber. Common culprits include a clogged air filter restricting airflow, a faulty carburetor running too rich, or old fuel gumming up the system. Replace the spark plug, then address the air filter and carburetor if the problem returns. Using fresh fuel and running the mower dry before storage also helps.
While some universal plugs may fit, OEM Yard-Man spark plugs are engineered for precise heat range and gap specifications for your exact engine model. Using a mismatch can cause hard starting, poor performance, or damage. A good approach is to genuine parts for reliability and model-specific fit and performance.
Most lawn mower spark plugs last 25–100 operating hours depending on fuel quality, air filter condition, and maintenance habits. Consider inspecting your plug at the start of each season and replacing it if the electrode is worn, corroded, or heavily carbonized.


Ordering lawn mower yard man lawn mower spark plug parts online is simple and gives you access to OEM options across every major brand. With same-day shipping on most in-stock items, you'll have your replacement part fast, minimizing downtime. Our model/part number lookup finds the exact OEM part for your unit, and every order is backed by our 365-day return policy and price-match guarantee. Browse our repair help section for troubleshooting tips, part testing guides, and step-by-step installation videos for your specific product.
Yard-Man typically places the model number on a label attached to the mower frame near the blade deck, though you may also find it under the seat or on the engine housing. Look for a combination of numbers and letters, and copy it exactly, including any dashes or slashes. Enter that number in the search bar to narrow the complete Yard-Man lawn mower parts catalog to parts that fit your specific unit. Using the full model number helps account for differences between otherwise similar mowers, so you can select compatible parts with less guesswork and avoid ordering something meant for another configuration.

Regular spark plug replacement keeps your Yard Man Lawn Mower starting cleanly and running at full power. Repair Clinic stocks OEM spark plugs for a wide range of engines, along with installation videos and gap-setting guides. Use the model number lookup to confirm the exact spark plug specification for your engine, and keep a spare on hand for the next tune-up.

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