NGK Spark Plug - 7938
Best current price£2.55from The Green Spark Plug Company
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The Green Spark Plug Company£2.55Visit shop Ngk Bkr5e 7938 Spark Plug Copper Core New Ngk-Bkr5e
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The Green Spark Plug CompanyNgk Bkr5e 7938 Spark Plug Copper Core New Ngk-Bkr5e
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Genuine BKR5E NGK Spark Plug - 7938 UK StockFree delivery in 1–3 days£6.99Visit shop →
Spark Plug For Polaris Magnum 425 2WD 95-97 NGK Nickel 7938 V-CutFree delivery in 1–3 days£7.18Visit shop →
Spark Plug Fit Polaris Xplorer 500 4WD 1997 NGK 5k Ohm Nickel V-CutFree delivery in 1–3 days£7.33Visit shop →
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NGK 7938 BKR5E Spark Plug for Sunny Primera Almera Vanette 100 Clarus Palio SEPH£10.42 delivery£7.63Visit shop →
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Spark Plug Fit Polaris Sportsman 500 4WD 96-08 NGK BKR5E NickelFree delivery in 1–3 days£8.13Visit shop →
2x NGK BKR5E 7938 Standard Spark PlugFree delivery in 1–3 days£8.31Visit shop →
GhostBikes.comNgk 7938 - Spark Plug For Polaris Big Boss 500 6X6 1998-2002
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Product Information
Full details
The NGK 7938 BKR5E spark plug is an ideal choice for automotive enthusiasts and DIY mechanics looking to restore or maintain reliable engine ignition performance. These nickel-alloy plugs provide consistent combustion and interference suppression, ensuring smooth idle and steady acceleration for a wide range of compatible vehicles. While they offer excellent value and reliability, they feature a standard nickel construction that requires more frequent replacement compared to high-end iridium or platinum alternatives.
All features
| Model Part Number | 7938 |
|---|---|
| Brand | NGK |
Extended Product Information
FAQs
Are these plugs pre-gapped?
While they come with a factory setting of 0.8-0.9mm, it is best practice to verify the gap with a feeler gauge to match your vehicle's specific manual requirements.
How often should I replace these plugs?
Nickel spark plugs typically require replacement every 20,000 to 30,000 miles depending on driving conditions.
What does the 5 kOhm suppression mean?
This refers to the built-in resistor that prevents the spark plug from creating radio frequency interference that could disrupt electronic sensors or car radios.
Can I use these in high-performance engines?
These are standard-grade plugs. If your engine is modified for high boost or high compression, you may require a colder heat range or a different material like iridium.
Do I need to apply anti-seize to the threads?
NGK generally advises against using anti-seize on their plugs as they have a specialized trivalent plating that prevents corrosion; applying extra lubricants can lead to over-torquing.
Troubleshooting
Engine misfire after installation
Verify that the spark plug wires or ignition coils are seated firmly on the terminal and check that the gap is set to the correct vehicle specification.
Difficult to thread into cylinder head
Stop immediately, remove the plug, and check for thread damage. Always start threading by hand to ensure proper alignment.
Engine pinging or knocking
Confirm that the heat range of the BKR5E is correct for your specific engine application; the 5-range may be too hot for certain high-performance modifications.
Pros and Cons
Pros
- Proven reliability and consistency from a trusted brand
- Effective noise suppression for sensitive vehicle electronics
- Cost-effective solution for routine engine maintenance
- Universal fitment for many older and mid-range engine platforms
Cons
- Shorter service life compared to iridium or platinum variants
- Requires manual gap verification before final installation
- Standard nickel construction is susceptible to faster electrode wear
Setup, Compatibility & Care
To install, ensure the engine is completely cool to avoid damaging threads in the aluminum cylinder head. Always use a spark plug socket with a 16mm hex size and a rubber insert to prevent damage to the ceramic insulator. Hand-thread the plugs initially to avoid cross-threading, then use a torque wrench to tighten to the manufacturer's specified torque rating—typically between 15-20 Nm. Regularly inspect the spark plug tip during oil changes; a light tan color is normal, whereas heavy black soot indicates a rich fuel mixture or incomplete combustion that needs further diagnosis.