NGK Spark Plug - 6667 - L05EA

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Ngk L05ea 6667 Resistor Spark Plug Cap New Ngk-L05ea Small

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Product Information

Full details

The NGK Spark Plug - 6667 - L05EA is designed for professionals seeking reliable noise suppression and consistent engine performance. It features a durable resistor element to prevent radio frequency interference without compromising power. While offering excellent noise suppression, some specialized ignition systems (like magnetos) may require non-resistor caps.

All features

Model Part Number	6667
Brand	NGK

Extended Product Information

FAQs

What is the main benefit of a resistor spark plug like the NGK 6667?

The primary benefit is noise suppression. The built-in resistor reduces radio frequency interference (RFI) that can disrupt electronic systems in the vehicle or nearby devices.

Will this spark plug affect my engine's performance?

No, NGK's unique and superior construction ensures that the resistor element does not cause a loss of performance or shorten the service life of the spark plug.

Can I use this plug in an older engine with a magneto ignition?

It is generally recommended to use non-resistor spark plugs or caps for magneto ignition systems. Check your specific magneto's requirements before installing a resistor plug.

How often should I replace this spark plug?

Replacement intervals vary depending on the engine and driving conditions. Consult your vehicle's service manual for the recommended replacement schedule.

What do the codes L05EA, LB05EMH, and SD05FM mean?

These codes typically indicate specific physical dimensions, heat ranges, and construction materials. LB05EMH and SD05FM are noted as being of tough EPDM rubber construction suitable for competition/trial applications.

How do I clean a fouled spark plug?

If a spark plug is lightly fouled, you can clean it gently with a wire brush. For heavy fouling, replacement is usually recommended.

Troubleshooting

Engine misfiring or running rough

Check spark plug for proper gap, fouling, or damage. Ensure it is securely installed and torqued correctly. Verify compatibility with the ignition system.

No spark at the plug

Inspect the spark plug wire connection. Check the ignition system components (coil, module, etc.) as per the vehicle's service manual. Ensure the spark plug itself is not faulty.

Reduced engine performance

Ensure the spark plug is the correct type and gap for the application. Check for carbon buildup on the electrodes. Verify the ignition system is functioning correctly.

Pros and Cons

Pros

Provides excellent noise suppression across all frequencies.
Maintains engine performance without adverse effects.
Durable construction resists heat, vibration, and moisture.
Reliable performance suitable for professional use.
Meets modern noise suppression standards.

Cons

May not be suitable for all ignition systems (e.g., some magnetos require non-resistor caps).
Specific part number (6667 / L05EA) limits direct application without verification.
Requires careful selection to ensure compatibility with specific engine requirements.

Setup, Compatibility & Care

Setup:

Ensure the engine is cool before attempting to remove the old spark plug.
Use the correct size spark plug socket wrench to carefully unscrew the existing plug.
Inspect the new NGK 6667 L05EA spark plug for any damage incurred during shipping or handling.
Thread the new spark plug in by hand to avoid cross-threading. Ensure it seats properly.
Tighten the spark plug using the appropriate torque specification for your engine. Over-tightening can damage the cylinder head.

Compatibility:

This spark plug (MPN 6667, model L05EA) is designed for specific engine applications. Always verify compatibility with your vehicle's manufacturer specifications or consult an NGK application guide.
While designed for noise suppression, confirm if your ignition system requires a resistor plug or a non-resistor type (e.g., some magnetos).

Care:

Regularly inspect spark plugs for signs of wear, fouling, or damage.
Clean spark plugs gently with a wire brush if minor fouling occurs. Avoid harsh chemicals.
Replace spark plugs according to the manufacturer's recommended service interval to maintain optimal engine performance.