Bolens String Trimmer Spark Plug Parts

Bolens String Trimmer Spark Plugs

A fouled or worn spark plug is often the reason your Bolens string trimmer won't start or runs rough. Spark plugs wear predictably — typically every season or after 100+ hours of use — and they're one of the easiest, cheapest maintenance fixes you can do. Most Bolens trimmers use a standard small-engine plug, but the exact type matters for reliable ignition.

Enter your Bolens model number to find the OEM spark plug spec, or check your owner's manual for the correct heat range. Keeping a spare plug in your trimmer bag means you're never stranded mid-season. Bolens String Trimmer Parts are all in stock, ready to ship same day.

• Trimmer won't start: Spark plug is fouled or gapped incorrectly
• Runs rough or stalls: Worn plug causing weak spark; replace for smooth operation
• Hard to start after sitting: Old plug with carbon buildup; new plug fires immediately
• Plug keeps fouling: Check carburetor health; a rich fuel mix floods the plug
• Seasonal maintenance: Replace plug every spring before heavy trimming season

Bolens String Trimmer Spark Plug FAQ

What spark plug does my Bolens string trimmer use?

Bolens is an MTD Products brand, and most Bolens trimmers run small engines that use standard plugs like Champion RJ19LM or NGK BR2LM. The exact type depends on your engine model (found on the engine block, not the trimmer housing). Check your owner's manual or use your model number on Repair Clinic to confirm the correct plug and gap specification.

How often should I replace the spark plug?

Replace your Bolens trimmer spark plug every season before heavy use, or after 100+ hours of operation. If you notice hard starting, rough running, or fouling after just a few hours of use, the plug may be failing prematurely — which often signals a carburetor issue or fuel mixture problem.

Why does my Bolens trimmer spark plug keep fouling?

A plug that fouls repeatedly is usually a symptom, not the root cause. Common culprits: a rich fuel mixture from a stuck carburetor needle, old gasoline with ethanol separation, or incorrect plug heat range. Replace the plug first; if it fouls again within hours, clean or rebuild the carburetor. Ethanol-blended fuel can clog carburetors over the off-season — always run the fuel tank dry or add fuel stabilizer before storage.

Can I use an aftermarket spark plug instead of OEM?

OEM plugs are always the safer choice. Champion and NGK plugs sold through Repair Clinic match Bolens/MTD specifications exactly — same heat range, same gap, same terminal type. Aftermarket plugs from other sources may have different heat ranges, which can cause fouling or weak spark. For just a few dollars more, OEM gives you reliability.

Order Bolens String Trimmer Spark Plug Parts Online

Ensure your Bolens string trimmer performs at its best by ordering genuine spark plug parts online. Our user-friendly platform allows you to quickly find compatible string trimmer parts using model or part numbers. Enjoy the convenience of same-day shipping, ensuring your spark plug replacements arrive promptly. With a No-Hassle 365-Day Returns policy and a Price Match Guarantee, you can purchase with confidence knowing you're getting competitive pricing. If your string trimmer won't start, a faulty spark plug might be the culprit. Replacing it can restore your equipment's functionality. For more tips on string trimmer troubleshooting, visit our repair help page. Also, find Bolens String Trimmer Parts for additional options. Repair Clinic empowers DIYers and professionals with extensive resources to save time and money on essential repairs.

Bolens String Trimmer Model Number: Where to Look

Bolens prints the model number on a label on many string trimmers, usually on the shaft or on the main housing near the engine. Turn the trimmer off and check around the recoil starter, engine cover, and shaft for a tag or stamped identification plate. Record the complete model number, including letters and numbers, because similar Bolens trimmers can use different parts. Enter that number in the search bar to narrow the full catalog to parts that fit your trimmer. The model number applies to the entire unit, not just the spark plug, so it helps match whatever repair or maintenance part you need. You get parts that fit the first time.