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The Green Spark Plug Company£2.20Visit shop Ngk B4-Lm 3410 Spark Plug Copper Core B4lm New Ngk-B4-Lm Medium
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The NGK Spark Plug (3410 / B4-LM) is designed for engine owners looking for reliable ignition performance and consistent cold-weather starting. As a world-leading ignition component, this plug is engineered to provide complete combustion, which improves fuel efficiency and reduces exhaust emissions; however, users should note that this specific model does not include interference suppression, making it best suited for standard engines that do not require R-type resistive plugs.
| Model Part Number | NGK-B4-LM |
|---|---|
| Brand | NGK |
This spark plug requires a 20.8 mm hex socket.
No, this model does not include interference suppression.
The thread length is 9.5mm.
No, you must ensure the plug's dimensions (14mm thread, 9.5mm length, gasket seat) match your engine's specific requirements.
Check your engine manual for service intervals, or replace it if you notice electrode erosion, heavy carbon buildup, or difficulty starting.
Yes, this plug features an unscrewable SAE connector to fit different ignition wire types.
Check the spark plug gap and ensure the electrode is free of carbon deposits or oil fouling.
Ensure the threads on the cylinder head are clean and undamaged; never force the plug into the socket.
Verify the spark plug is tightened to the correct torque specification to prevent compression loss.
To install the NGK 3410, ensure the engine is completely cool to avoid damaging the cylinder head threads. Clean the area around the spark plug hole before removal to prevent debris from entering the cylinder. When installing the new plug, thread it by hand first to avoid cross-threading, then use a torque wrench to tighten to the manufacturer's specified setting. This plug uses a gasket seat, which requires a specific amount of rotation after the gasket touches the cylinder head surface to achieve the correct seal. Periodically inspect the electrode for signs of fouling or excessive wear, and replace the plug according to your engine manufacturer's service interval recommendations.
