If you own a Craftsman mower, you know how important it is to keep it running smoothly. One small part can make a big difference—like the spark plug.
But with so many options out there, which spark plug fits your Craftsman mower perfectly? Choosing the right one can save you time, money, and frustration. You’ll discover exactly what spark plug fits your mower, why it matters, and how to make the best choice.
Keep reading to get your mower back to peak performance quickly and easily.
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Craftsman Mower Spark Plug Basics
Spark plugsare small but very important parts of a Craftsman mower. They create the sparkneeded to start the engine by igniting the fuel and air mix. Without a good spark plug, the mower may not start or run well.
There are several types of spark plugsused in Craftsman mowers. The most common types include:
- Copper spark plugs: Good heat transfer and affordable.
- Platinum spark plugs: Last longer and resist wear.
- Iridium spark plugs: Very durable and provide strong sparks.
Choosing the right spark plug helps the mower run smoothly and last longer.
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Choosing The Right Spark Plug
Choosing the right spark plug ensures your Craftsman mower runs smoothly. Each mower model needs a specific spark plug size and type. Using the wrong spark plug can cause poor engine performance or damage.
Check your mower’s manual for the exact spark plug model. Common plugs for Craftsman mowers include types like Champion RJ19LMand NGK BPR5ES. These fit many popular models.
| Craftsman Mower Model | Recommended Spark Plug | Gap Size (inches) |
|---|---|---|
| Craftsman 917.377011 | Champion RJ19LM | 0.030 |
| Craftsman 247.37421 | NGK BPR5ES | 0.030 |
| Craftsman 917.376911 | Champion RJ19LM | 0.030 |
The spark plug’s heat rangeis very important. It controls how hot the plug gets. Too hot or too cold plugs cause engine issues. Choose a spark plug with the correct heat range for your mower engine to avoid fouling or overheating.
Top Spark Plugs For Craftsman Mowers In 2025
NGK spark plugs are very popular for Craftsman mowers. They are known for their long life and strong performance. These plugs help your mower run smoothly. They also ensure easy starts every time. NGK plugs can handle high temperatures well. So, they are perfect for tough mowing jobs. Many users trust NGK for their reliable spark.
Champion spark plugs are also a great choice for Craftsman mowers. They offer strong performance and durability. Champion plugs have a special design. This design helps in better fuel efficiency. They can also withstand rough conditions. Many people love Champion for their consistent quality. They keep the mower running smoothly and efficiently.
Bosch spark plugs provide excellent quality and performance. They are designed to improve engine power. Bosch plugs ensure a quick start every time. They also reduce harmful emissions. This makes them an eco-friendly choice. Bosch is trusted by many for its precision engineering. They help keep your Craftsman mower in top shape.
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How To Replace A Spark Plug
Finding the right spark plug for a Craftsman mower ensures smooth engine performance. Use the model number to match the exact spark plug type needed. Replacing it is simple and improves mower start-up and running.
Tools Needed
- Spark plug socket(usually 5/8 inch or 13/16 inch)
- Ratchet wrenchto fit the socket
- Gap gaugeto check spark plug gap
- New spark plugcompatible with Craftsman mower
- Torque wrench(optional but recommended)
- Work glovesfor hand protection
- Clean clothto wipe dirt
Step-by-step Replacement Guide
First, disconnect the spark plug wire by pulling the boot off carefully. Clean around the spark plug to avoid dirt falling inside the engine. Use the spark plug socket and ratchet to loosen and remove the old spark plug. Check the gap on the new spark plug with the gap gauge. Adjust the gap to the mower’s manual specification. Screw in the new spark plug by hand to avoid cross-threading. Tighten the spark plug with a socket or torque wrench but don’t overtighten. Reattach the spark plug wire securely onto the new plug.
Safety Tips
- Make sure the mower is off and cool before starting.
- Disconnect the spark plug wire to prevent accidental starting.
- Wear gloves to protect your hands from sharp parts.
- Work in a well-lit and ventilated area.
- Keep tools and parts away from children and pets.
Spark Plug Maintenance Tips
Cleaning spark plugs helps keep your Craftsman mower running well. Use a wire brush to remove dirt and carbon deposits. Avoid using harsh chemicals that might damage the plug. Gently wipe the plug with a clean cloth after brushing. Check the gap between the electrodes with a feeler gauge. Adjust the gap to the mower’s specifications if needed.
Signs of wearinclude a cracked insulator, worn electrodes, and heavy deposits. A spark plug that looks black and oily may not work properly. If the engine is hard to start or runs rough, the spark plug might be the problem.
- Replace spark plugs every 25 hours of use or once a year
- Change plugs if the mower stalls or misfires
- Use the correct plug model recommended for Craftsman mowers
- Always check the owner’s manual for proper spark plug type and gap
Troubleshooting Spark Plug Issues
Common problemswith spark plugs include fouling, wear, and poor connection. A fouled spark pluglooks black and sooty. It causes the mower to run poorly or not start. Worn spark plugshave a rounded or damaged electrode. This leads to weak sparks and engine misfires. Loose or corroded connections stop the spark plug from working well.
Diagnosing spark plug faultsstarts by removing the plug and checking its condition. Look for black soot, cracks, or worn parts. A spark tester can check if the plug produces a strong spark. Make sure the spark plug wire is tight and clean. Check the gap with a gauge; it should match the mower’s manual.
Quick fixesinclude cleaning or replacing the spark plug. Tighten the spark plug wire securely. Adjust the gap if it is too wide or narrow. Replace the plug if it is cracked or badly worn. Regular checks can prevent many problems and keep the mower running smoothly.
Frequently Asked Questions
What Spark Plug Size Fits Craftsman Mower Engines?
Most Craftsman mowers use a standard 14mm spark plug size. Always check your mower’s manual for exact specifications.
How To Identify The Right Spark Plug For Craftsman Mowers?
Check the engine model number on your mower. Use this to find the recommended spark plug type in the manual.
Can I Use A Champion Spark Plug In Craftsman Mowers?
Yes, Champion spark plugs are often compatible with Craftsman mowers. Ensure the model matches your engine’s requirements.
How Often Should I Replace The Spark Plug In A Craftsman Mower?
Replace the spark plug every 25 hours of use or once per mowing season for optimal performance.
Conclusion
Choosing the right spark plug keeps your Craftsman mower running well. A proper fit helps the engine start quickly and stay smooth. Always check your mower’s manual for the exact spark plug type. Using the correct spark plug saves time and money on repairs.
Regular maintenance extends your mower’s life and improves performance. Simple steps like this make mowing easier and less stressful. Remember, small details matter for a strong-running mower. Keep your mower ready and enjoy a neat, healthy lawn all season.
