NGK 7588 Iridium IX Spark Plug YR55IX Taper Cut Resistor Plug

The NGK 7588 Iridium IX spark plug (NGK plug number YR55IX) is built for performance enthusiasts and works well as an upgrade over standard nickel alloy plugs. It has a fine wire iridium center electrode and a tapered cut ground electrode. Together they deliver strong ignitability, good anti-fouling and dependable performance in modified or high performance engines.

Key Features:

• Single iridium tip: 0.6 mm fine wire iridium center electrode gives a consistently stable spark and long service life.
• Iridium alloy center electrode: Iridium is about six times harder than platinum and has a very high melting point, which suits modern high efficiency engines.
• Tapered cut ground electrode: The reduced quenching design improves starting, idling, throttle response, acceleration and fuel efficiency.
• Solid copper core: Copper in the core improves heat dissipation and conductivity across a wide heat range.
• Trivalent metal plating: Resists corrosion and seizing, which makes installation and removal easier.
• Resistor design: Non-removable terminal nut. Ceramic insulator. Pre-gapped at 0.060 in (1.5 mm).

The NGK Iridium IX is recommended for modified or high performance applications, or as an upgrade to OE nickel alloy plugs. NGK has supplied OE spark plugs for domestic and import vehicles for decades and manufactures plugs for automotive, motorcycle, marine and small engine applications.