Murray String Trimmer Spark Plug Parts

Murray String Trimmer Spark Plug Replacement Parts

A fouled or worn spark plug is one of the quickest fixes for a Murray string trimmer that won't start or runs rough. The spark plug ignites the fuel-air mixture in the engine — when it's dirty, gapped wrong, or just old, you lose ignition and the trimmer either won't fire at all or starts reluctantly and bogs down under load. Most Murray trimmers use a standard Champion or NGK plug; finding the right heat range for your model is the key to reliable starts every season.

Spark plugs are a seasonal maintenance item. If your Murray trimmer sat unused over winter or summer, the old plug has likely fouled from stale fuel or carbon buildup. Swapping in a fresh OEM-spec plug often solves hard-start issues without touching the carburetor. Keep a spare plug in your trimmer bag — they're $3 to $8 and take 30 seconds to change.

• Plug won't fire: Dead or severely fouled spark plug; check gap (typically 0.028 to 0.032" for Murray engines)
• Engine starts then quits: Plug carbon-fouled from old fuel; clean or replace
• Rough idle or bogging under load: Weak or incorrectly gapped plug; heat range mismatch
• Black sooty deposits on plug: Running too rich; plug is a symptom; check fuel line and carburetor too
• White/tan deposits on plug: Running lean or overheating; verify cooling fins are clear

Use your Murray model number to confirm the exact Champion or NGK plug type and gap specification. Murray String Trimmer Spark Plug Parts are in stock and ready to ship same-day. Enter your trimmer's model number above to find the right plug for your engine.

Murray String Trimmer Spark Plug FAQs

What spark plug does my Murray string trimmer use?

Most Murray string trimmers with small engines use either a Champion RJ19LM or NGK BR2LM spark plug, but heat range and gap specifications vary by engine displacement and model year. Look up your trimmer's model number on the equipment nameplate — we'll show you the exact OEM spark plug type and the correct gap setting (usually 0.028 to 0.032 inches). Never assume plugs are interchangeable across engine sizes; using the wrong heat range can cause hard starting or overheating.

How do I know if my spark plug is bad?

A fouled or dead spark plug shows itself in several ways: the trimmer won't start no matter how many times you pull the cord, it starts but dies immediately, or it runs rough and bogs down when you squeeze the throttle. You can also pull the plug and inspect it — black sooty buildup means it's carbon-fouled (often from stale fuel), a white or tan coating suggests the engine is running lean, and a gap that's too wide (gap wider than 0.035 inches) won't fire reliably. If the plug looks clean but the trimmer still won't start, test continuity across the gap with a multimeter — a dead plug will show no spark when grounded against the cylinder.

Can I clean and reuse a spark plug instead of replacing it?

Cleaning a carbon-fouled spark plug with a wire brush can work as a quick temporary fix, but it's not ideal long-term. The plug will foul again if the underlying cause (old fuel, rich carburetor, blocked fuel filter) isn't addressed. OEM spark plugs are cheap — $3 to $8 — and a fresh one help ensure proper ignition. If you clean a plug and gap it correctly, it may buy you a few more uses, but replacing it is always the more reliable path. For seasonal equipment like string trimmers, replacing the plug at the start of each season is standard maintenance.

Why does my Murray trimmer spark plug keep fouling?

A plug that fouls repeatedly points to one of three problems: stale or contaminated fuel (ethanol in gas breaks down and clogs the carburetor), a carburetor running too rich (excess fuel, not enough air), or a blocked air filter restricting airflow. Check your fuel first — drain old gas and refill with fresh fuel and 2-cycle oil in the correct ratio (usually 50:1 for Murray gas trimmers). Then clean or replace the air filter. If the plug still fouls after those steps, the carburetor needs cleaning or adjustment — that's where a carb kit or professional service comes in.

Order Murray String Trimmer Spark Plug Parts Online

Ensure your Murray string trimmer runs efficiently by ordering genuine spark plug parts online. Finding the right replacement parts is simple with our model number lookup feature, to ensure the right fit. Our same-day shipping on in-stock partss that your parts arrive fast, minimizing downtime. Common issues such as a trimmer that won't start can often be resolved by replacing a faulty spark plug. Access our String Trimmer Repair Help section for more troubleshooting tips. Order today and keep your Murray string trimmer performing at its best!

Murray String Trimmer Model Number: Where to Look

On Murray string trimmers, look for the model number on a label attached to the main housing near the engine or along the shaft. You may need to clear away grass or dirt to read the decal, and be sure to copy every letter and number exactly as shown. Enter it in the model number search to pull up the parts matched to your unit. The model number filters the full Murray string trimmer parts catalog, not just one part category, so you can quickly narrow the results to parts built for your specific trimmer. That means fewer wrong orders and a faster repair.