NGK Spark Plug Stock # 2420 (Motorcycle)

The NGK Spark Plug Stock # 2420 is a premium OEM-grade spark plug engineered specifically for modern motorcycles and small-displacement engines. If you're a rider or mechanic serious about reliable ignition, this is the spark plug for sale that delivers consistent cold-start performance and smooth throttle response across a wide temperature range. NGK's reputation in the powersports industry rests on decades of precision manufacturing and thermal engineering—and the D9EA ceramic insulator core is no exception.

This spark plug uses a nickel-plated center electrode and a specially formulated ceramic insulator designed to resist fouling and carbon buildup during lean-running conditions common in high-performance and tuned motorcycle engines. The compact 0.85-inch diameter and 3.1-inch length ensure seamless fitment in tight cylinder head galleries, while the optimized gap geometry promotes rapid flame kernel development for faster combustion. The 0.09 lb weight reflects NGK's precision casting—there's no wasted material, just proven thermal conductivity and electrical reliability built into every unit.

Riders and mechanics choose NGK Spark Plug Stock # 2420 specifications when rebuilding top ends, troubleshooting misfires, or maintaining stock tune on everything from street bikes to dirt bikes and small-bore cruisers. Installation is straightforward—gap the electrode to your manufacturer's spec, torque to the proper foot-pounds, and verify no cross-threading of the ceramic insulator. For best results, replace at the interval your owner's manual recommends; fresh spark plugs are inexpensive insurance against hard starts and uneven running.