NGK Spark Plug Stock # 4549

The NGK Spark Plug Stock #4549, model CR7HSA, is a premium OEM-grade spark plug designed for reliable ignition in a variety of small-displacement and mid-sized engines. This spark plug is ideal for those maintaining factory equipment, restoring classic motorcycles, or tuning modified four-cylinder engines, ensuring consistent performance across diverse applications.

Engineered with trivalent-plated shells and nickel-alloy electrodes, the CR7HSA spark plug resists fouling and corrosion, even in high-heat combustion chambers. Its optimized heat range of 7 and electrode geometry enhance flame kernel formation, which is crucial for precise ignition timing whether at full throttle or idle. This robust construction minimizes electrode erosion, making it suitable for both stock applications and mild performance builds.

Users will benefit most from the NGK CR7HSA plugs when they maintain consistent fuel quality and proper ignition timing, both of which are essential for extending spark plug life and preventing pre-ignition in modified engines. Installation is straightforward, and it is compatible with a wide range of metric and small-displacement applications, including ATVs, lawn equipment, and compact automotive engines.