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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.

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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Briggs & Stratton Platinum Spark Plug (793541)
A fouled or worn spark plug is one of the most common reasons your Yard Machines mower won't start or runs rough. If your engine has weak spark, struggles to turn over in spring, or idles rough during cutting season, the spark plug is often the culprit. Genuine OEM Yard Machines spark plugs ensure proper gap, heat range, and ignition timing for reliable starts and clean performance all season long.
We stock genuine Yard Machines lawn mower parts including spark plugs, spark plug boots, ignition coils, and recoil starters—all backed by fast shipping and our satisfaction help ensure. Find your exact model number on the deck or frame to get the right fit.
Yard Machines mowers typically use Champion or similar mid-range spark plugs, but the exact model depends on your engine size and year. Always check your operator's manual or the engine block for the recommended plug type. Once you locate your mower's model number (usually on a label near the engine), you can cross-reference it to find the correct OEM spark plug at Repair Clinic with confidence.
Most lawn mower spark plugs should be inspected annually at the start of mowing season and replaced every 100–200 operating hours, or roughly every 1–2 years if you mow weekly. If your plug looks black and sooty or has a gap wider than 0.030 inches, replace it immediately. A fresh plug costs just a few dollars and will restore clean starts and smooth running.
No spark usually means either a bad spark plug, a cracked spark plug boot, or a failing ignition coil. Start by removing the spark plug and checking for corrosion, fouling, or a cracked tip. If the plug looks clean, test the ignition coil with a spark gap tool or swap in a known-good plug to narrow down the problem. Genuine OEM parts eliminate guesswork and save you time.
Your model number is stamped on a label affixed to the mower deck, usually near the front or side of the frame, or on the engine block itself. Snap a photo and use it to search Repair Clinic's parts catalog. Entering your model number help ensure you order the exact spark plug, boot, or ignition coil your mower needs—no mismatches, no returns.


Ordering lawn mower yard machines 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 Machines usually prints the model number on a label attached to the mower deck or frame, often near the blade housing or along the side of the machine. Check the engine housing as well if you do not see it on the deck, and wipe away grass or dirt that may hide the label. The model number identifies the entire mower, not just the spark plug or another individual part. Enter it in the model number search, and the catalog will narrow to parts matched to your unit, including maintenance and repair parts. That means fewer wrong orders and a faster repair.

Regular spark plug replacement keeps your Yard Machines 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.

Repair Clinic has five ways for you to stop your lawn mower from leaking gas. Before we get to those, let's review how the gasoline you pour into the tank powers the mower.

Why does your lawn mower battery keep dying? Repair Clinic has done the research and this article will provide some answers, starting with what a battery's purpose is on a gas-powered lawn mower.

What's causing that black smoke to billow out of the engine? There are three likely reasons and they are all related to how a gas-powered lawn mower engine operates.