NGK Spark Plug BMR6A - 7421

The BMR6A NGK Spark Plug is a single nickel spark plug designed for ignition service and engine st...

Best current price£3.70from The Green Spark Plug Company

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The Green Spark Plug CompanyNgk Bmr6a 7421 Spark Plug Copper Core New Ngk-Bmr6a
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Product Information

Full details

The NGK BMR6A spark plug is designed for automotive and small engine enthusiasts looking for a reliable, single-nickel ignition component to ensure consistent starting performance. It is an ideal choice for a wide array of vehicles, motorcycles, and utility equipment requiring high-quality ignition parts. While it offers excellent compatibility across many applications, users should verify their specific engine requirements against the manufacturer’s technical specifications, as small variations in spark plug reach or heat range can impact engine health.

All features

Model Part NumberBMR6A
BrandNGK

Extended Product Information

FAQs

How often should I replace the NGK BMR6A?

Replacement intervals depend on the engine type and usage conditions. Refer to your vehicle or equipment owner's manual for recommended service intervals.

Is the BMR6A pre-gapped?

While some plugs come pre-gapped, you should always verify the gap with a feeler gauge to ensure it meets your specific engine requirements.

Can I use this in any engine?

No. Only use this spark plug if it is explicitly listed as compatible with your specific engine model. Using the wrong plug can cause engine damage.

What does the 'BMR' in the part name mean?

NGK part numbers use a coding system; 'B' refers to the thread diameter, 'M' indicates a compact type, and 'R' typically signifies a resistor-type plug.

Does this spark plug come with a warranty?

The product is covered by a 60-day return policy as per the merchant's terms and conditions.

Troubleshooting

Engine misfiring or running roughly

Check the spark plug gap to ensure it matches the vehicle manufacturer's specification and inspect the electrode for excessive carbon deposits.

Difficulty starting the engine

Verify that the spark plug wire is fully seated on the terminal and check that the plug threads are clean and free of debris.

Plug fouling quickly

Check the air-fuel mixture and air filter; a rich running engine can cause premature fouling of the spark plug electrodes.

Pros and Cons

Pros

  • High reliability for consistent engine starting
  • Excellent compatibility across diverse engine types
  • Durable nickel alloy construction
  • Meets or exceeds OEM specifications
  • Wide range of automotive and small engine utility

Cons

  • Single-nickel design may require more frequent replacement than iridium variants
  • Requires manual gap verification before installation
  • Not suitable for high-performance racing applications

Setup, Compatibility & Care

Before installation, always consult your owner’s manual or a service technician to ensure the BMR6A is the correct heat range for your specific engine. When installing, start the plug by hand to avoid cross-threading, then tighten using a torque wrench according to the vehicle manufacturer’s specifications. Avoid over-tightening. Periodic maintenance should include inspecting the firing end for carbon buildup or electrode wear every few thousand miles, depending on the engine's manufacturer guidelines.

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