Autolite AR3910X Spark Plug

  Fuel Compatibility: Gasoline or Methanol Key Benefits: Replacement racing spark plug used by professional car drivers. Colder heat ranges for enhanced performance modifications and durability under intense conditions. Yttrium-enhanced alloy reduces sidewire temperature by up to 8% for less pre-ignition and improved durability. Cut-back ground electrode for better flame kernel ignitability. Coated with anti-corrosive nickel plating to prevent rusting. Potential for up to 3/4 HP gain compared to the stock clone plug.   Usage Tip: Run the engine hot (at least 425°F) for optimal performance.   Compatibility   Most 5.5HP or 6.5HP OHV Honda / Clone Engines Honda GX160 / GX200 Predator 212cc Briggs Animal / LO206   Technical Specifications Specification Detail Seat Flat Thread Size M14 Hex Size (mm) 16mm Hex Size (in) 5/8 Inch Center Electrode Material Nickel Preset Gap (in) 0.030 Inch Preset Gap (mm) 0.80mm