BPR4ES – NGK Resistor Spark Plug
✅ Characteristics / Specifications
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Thread Size (Diameter): 14 mm
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Thread Pitch: 1.25 mm
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Reach / Length: 19 mm (¾")
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Seat Type: Flat / gasket style
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Hex / Wrench Size: 21 mm (13/16”)
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Resistor Value: 5 kΩ (built‑in resistor to reduce radio interference)
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Tip / Projection Type: Projected / extended electrode
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Standard Gap: ~ 0.8 mm (0.031”)
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Terminal Type: Removable nut / solid top
🔍 Product Use & Application
The NGK BPR4ES spark plug is widely used in small engines across lawn mowers, generators, outdoor power equipment, and some motorcycles. Its resistor construction helps suppress ignition noise in electronic systems. Always verify thread, reach, and heat range matches your engine before installation.
⭐ Features & Benefits
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✅ Reliable Ignition — Produces consistent spark under load
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✅ Built‑In Resistor — Helps reduce interference in electronics
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✅ Durable Construction — Materials and design built for frequent use
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✅ Direct Replacement — Fits many engines that specify BPR4ES
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✅ Easy Maintenance — Common size, easy to source
⚠️ Installation Tips
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Always use correct torque to avoid damaging the plug or engine threads
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Check / adjust spark plug gap before installing
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Use anti‑seize on threads if permitted by the engine manufacturer
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Replace spark plugs at regular maintenance intervals for optimal performance
