Spark Plug Stock 7823

The NGK Spark Plug Stock 7823 (BPR4HS) is a premium OEM-specification spark plug engineered for reliable ignition across a wide range of small-displacement and mid-range engines. Whether you're maintaining a daily driver, rebuilding a classic four-cylinder, or tuning a motorcycle, this NGK standard-heat-range plug delivers consistent cold-start performance and steady-state combustion efficiency. As a mechanic, you'll recognize the BPR4HS as the workhorse choice for engines that demand reliability without premium pricing.

This plug features NGK's proven copper-core electrode design, which provides excellent thermal conductivity and rapid heat dissipation—critical for preventing carbon fouling and extending service intervals. The BPR4HS employs a standard-reach configuration with proven gap geometry optimized for conventional ignition systems, ensuring consistent spark timing across full throttle and idle conditions. The compact 0.12 lb design and standard 3.45-inch length fit OEM specifications precisely, eliminating the guesswork during installation and avoiding cross-threading or improper seating that compromises combustion."

This spark plug is ideal for routine maintenance, engine rebuilds, and performance baseline tuning on carbureted and fuel-injected four-strokes. Installation is straightforward—gap the electrode to OEM spec (typically 0.028–0.032 inches), torque the plug to manufacturer torque specs, and verify cold-start behavior before high-load operation. Stock multiple units for fleet vehicles, shop kits, or seasonal equipment maintenance to ensure you're never caught without a replacement when a plug fouls or ages beyond its service life.