Craftsman String Trimmer Spark Plug Parts

Craftsman String Trimmer Spark Plug Replacement Parts

The spark plug is one of the simplest but most critical maintenance items for your Craftsman string trimmer. A fouled, worn, or incorrect spark plug will cause hard starting, rough running, and loss of power — often mistaken for a carburetor or fuel system problem. Replacing the spark plug annually (or more frequently if you use the trimmer heavily) keeps your trimmer starting reliably and running clean.

Craftsman gas trimmers use standard spark plugs, but the heat range and gap matter. Using the wrong type can cause fouling or pre-ignition. Always check your manual or use your model number to confirm the correct plug specification before ordering. OEM-equivalent plugs from Champion and NGK are your best bet for consistent performance.

• Hard starting or won't start: fouled plug from old fuel, wrong fuel mix, or cold running
• Rough idle or surging: plug gap too wide or plug heat range incorrect
• Loss of power under load: plug electrodes worn or carbon-fouled
• Black sooty buildup on plug: running too rich; check carburetor after replacing plug
• Annual maintenance: replace spark plug every season, especially before spring startup

Craftsman String Trimmer Spark Plug Questions

What is the correct spark plug for my Craftsman string trimmer?

Craftsman gas string trimmers typically use Champion RJ19LM or NGK BR2LM spark plugs, but always verify with your model number before purchasing. The manual for your trimmer will list the exact specification. Using the wrong heat range can cause fouling (too cold) or pre-ignition (too hot). Enter your Craftsman model number on Repair Clinic to confirm the correct plug and avoid startup headaches.

Why is my Craftsman trimmer hard to start even with a new spark plug?

A new plug helps, but hard starting usually points to the fuel system first. Check: (1) Fresh fuel mix — ethanol-stabilized fuel goes stale in 30 days; (2) Correct oil ratio — typically 50:1 for Craftsman gas trimmers; (3) Primer bulb — squeeze it 5 to 10 times to prime fuel to the carb. If the trimmer still won't start after the plug and fuel are fresh, the carburetor itself may be gummed from old fuel. A carburetor rebuild kit is often the next step.

How often should I replace the spark plug in my Craftsman string trimmer?

Replace the spark plug at least once a year, ideally at the start of the mowing season. If you use the trimmer frequently (twice weekly or more), replace it twice yearly or every 50 hours of operation. A fouled plug from old fuel sitting in the tank over winter is one of the top reasons Craftsman trimmers won't start in spring. Keeping a spare plug in your maintenance kit prevents downtime in the middle of a job.

Can I use any spark plug in my Craftsman trimmer, or does it have to be exact OEM?

The heat range and gap specification matter more than the brand. Champion RJ19LM and NGK BR2LM are the industry standards for most Craftsman gas trimmers and cross-compatible with other brands. However, using a plug with the wrong heat range or gap will cause problems. Look up your Craftsman model number on Repair Clinic to confirm the correct spec — it takes 30 seconds and saves you a frustrating day of troubleshooting.

Order Craftsman String Trimmer Spark Plug Replacement Parts Online

Ordering Craftsman string trimmer spark plug replacement parts online is simple with Repair Clinic. You can easily search by model number or part number to find the exact spark plug you need. Whether you're replacing a spark plug in a Craftsman 25cc weedwacker or a Craftsman 27cc weed eater, we have the parts to get the job done. Enjoy our No-Hassle 365-Day Returns, which allows you to return uninstalled parts within a year of purchase. With our Price Match Guarantee, you can be confident you're getting competitive pricing on genuine OEM parts for your Craftsman weed eater.

We offer same-day shipping on orders placed by 9:00 PM ET, so you can get the parts you need quickly and easily. Whether you're a DIY enthusiast or a professional technician, our expert resources and support team are available to assist you in troubleshooting and repairing your string trimmer efficiently. Find the right replacement spark plug for your Craftsman weedwacker or other models today and get back to your outdoor work.

Find the Model Number on Your Craftsman String Trimmer

Craftsman prints the model number on a label on the main housing near the engine, along the shaft, or beside the recoil starter on many string trimmers. Before ordering, locate the complete model number, including letters, numbers, and any punctuation, so you can identify the exact unit. Enter it in the model number search to pull up the parts matched to your unit across the full Craftsman string trimmer catalog. This filters out parts made for different trimmer designs and helps you choose compatible replacement parts for the whole machine. You order with confidence knowing the fit is right.