NGK Spark Plug Stock # 6664

The NGK Spark Plug Stock # 6664 is a premium iridium electrode ignition component engineered for small-displacement engines requiring reliable cold-start performance and extended service intervals. Designed for OEM and aftermarket applications where consistent spark delivery matters, this 14mm threaded plug delivers the dependable ignition characteristics that motorcycles, ATVs, generators, and compact automotive engines demand. NGK's iridium construction ensures superior arc stability across the full operating temperature range, making this spark plug an ideal choice for riders and equipment operators who prioritize fuel efficiency and engine longevity.

The BR7EIX features NGK's Iridium IX technology, which utilizes a fine-wire iridium center electrode paired with a precisely machined nickel alloy ground electrode to create a smaller spark gap that ignites fuel mixtures more efficiently than conventional plugs. The 0.749-inch reach specification ensures proper electrode positioning within the combustion chamber without fouling or gap erosion, while the gasket seat design provides a reliable flame-tight seal that prevents exhaust gas leakage. The resistor element suppresses electromagnetic interference, protecting sensitive engine management sensors and radio communications from ignition noise—a critical feature in modern applications where electronic control modules govern fuel injection and ignition timing.

This spark plug performs best in engines where OEM specifications call for a BR7E or equivalent compact plug with fine-wire iridium performance. Installation is straightforward: verify correct thread size and reach against your engine's spark plug hole, set the gap if required per your manufacturer's service manual, and torque to specification to ensure proper gasket seating. The lightweight design (0.13 lbs) makes handling easy, while the compact 1 x 0.85 x 3.45-inch profile fits standard ignition coil boots without modification. Whether you're maintaining a trusted motorcycle, restoring power equipment, or building a custom small-displacement engine, the NGK BR7EIX delivers consistent ignition performance that extends engine life and improves fuel economy.