NGK Spark Plug Stock # 6706

The NGK Laser Iridium spark plug (Stock #6706, MPN LKAR8AI-9) is a precision ignition component engineered for small-displacement gasoline engines requiring reliable cold-start performance and consistent spark delivery. Built to OEM specifications with a 12 mm thread diameter and 26.5 mm reach, this resistor-type spark plug serves technicians, mechanics, and equipment owners who demand factory-level reliability in automotive, small engine, and portable equipment applications. Whether for routine maintenance or performance engine builds, the NGK Laser Iridium platform represents the trusted standard in ignition technology.

NGK's Laser Iridium design features a fine-wire iridium center electrode paired with an iridium-alloy ground electrode, delivering a more focused spark kernel and faster flame-front propagation than conventional nickel plugs. The gasket-seat design ensures reliable compression sealing in OEM cylinder head configurations, while the resistor construction minimizes radio frequency interference—critical for modern engine management systems and onboard diagnostics. This combination extends service life by reducing electrode erosion and fouling, translating to better fuel efficiency, improved throttle response, and more stable idle characteristics across varying load conditions.

Technicians and equipment operators benefit from NGK Laser Iridium spark plugs when servicing compact engines in motorcycles, ATVs, lawn equipment, and light-duty automotive platforms. Proper installation requires confirming thread size (12 mm), reach specification (26.5 mm), and gasket-seat compatibility with your specific engine head before purchase. Installation is straightforward: remove the old plug, gap-check if needed (consult your engine manual), apply a light coat of dielectric grease to the ceramic insulator, and torque to manufacturer specifications—typically 18–24 foot-pounds for most small-displacement applications.