NGK Spark Plug - BKR5EIX11 / BKR5EIX-11 The NGK BKR5EIX11, also known as BKR5EIX-11, represents the cutting edge in spark plug technology. Featuring a highly advanced iridium electrode, this spark plug offers superior performance and longevity compared to traditional spark plugs. The iridium center electrode is 25% smaller than a platinum electrode and a quarter of the size of a conventional nickel electrode. This small size allows for better spark delivery, reduced voltage requirements, and improved engine performance. The NGK BKR5EIX11 is designed for high-performance engines, with features like an ultra-fine 0.6mm iridium center electrode, taper-cut ground electrode, and a projected tip that ensures better ignition efficiency, increased acceleration, and enhanced fuel efficiency. Key Features: Iridium Electrode: The center electrode is 25% smaller than platinum and just a quarter the size of a conventional nickel electrode, enhancing spark efficiency. Reduced Voltage Requirement: The small diameter of the center electrode allows the spark to ignite more easily, improving ignition and reducing wear on the ignition system. Tapered Cut Ground Electrode: Improves flame core growth for better combustion and power output. Durability: The iridium center electrode is stronger and harder than platinum, offering longer service life. Corrosion Resistance: Metal shell plating has enhanced anti-corrosion properties, extending the plug's life. Resistor Type: Helps in reducing electromagnetic interference. Sold Individually: Each spark plug is sold separately. Specifications: Heat Range: 5 Thread Size: 14 mm Type: Resistor Weight: 0.43 lbs Gap Size: 0.043" (1.1 mm) Hex Size: 5/8" (16 mm) Reach: 19mm (3/4") Seat Type: Gasket Terminal Nut: Solid Electrode Tip: Projected, Fine Wire (0.6mm) Iridium Center Electrode, Tapered Cut Ground Electrode Compatibility: This NGK BKR5EIX11 spark plug is compatible with various high-performance and off-road engines, including: Honda: 2015-2017 Honda TRX420FA Rancher AT 4x4 2014-2017 Honda TRX420FA1 Rancher Automatic DCT 4x4 2013-2017 Honda TRX420FE Rancher ES 4x4 2013-2017 Honda TRX420FM Rancher 4x4 2016-2017 Honda TRX500FA5/FA6 Foreman Rubicon 4x4 Polaris: 2004-2005 Polaris ATP 500 H.O. 1999-2003 Polaris Magnum 500 4x4 2001-2007 Polaris Ranger 4x4 500 Kawasaki: 1991 Kawasaki KX250 1986-2004 Kawasaki KX500 1987-1998 Kawasaki KX80 1997-2004 Kawasaki KX60 Yamaha: 1995-2001 Yamaha WR250Z 1990-1998 Yamaha YZ125 1985-1998 Yamaha YZ250 1986-1997 Yamaha IT200 Alternate Part Numbers: 5464 BKR5EIX11 The NGK BKR5EIX11 spark plug is ideal for improving engine performance, boosting acceleration, and enhancing fuel efficiency in high-performance and off-road engines. Part Number: 37-BKR5EIX-11