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Best Spark Plugs

Champion 861 Spark Plug J19Lm...
  • Triple coated shell for excellent corrosion resistance.
  • Triple seal assembly- The strongest in the industry.
  • Precision tooled Threads conform to all manufacturers' Specifications.
  • fit type: Vehicle Specific
  • included components: Champion 861 Spark Plug J19Lm Ea.Boxed Champion
New Splitfire Spark Plug,...
  • Extended reach Spark Plug for 2 Stoke Motorized Bikes
  • Replaces stock spark plug - Works best with the old design cylinder head
  • Fits 48cc, 50cc, 66cc & 80cc 2 stroke engines
  • The Original Performance Spark Plug (NOS*)
  • Free shipping (lower 48 only)
Bosch (4504) Platinum IR...
  • Fused iridium and platinum center electrode, sintered into an extended insulator nose results in reaching self-cleaning temperature only seconds after starting and provides exceptional wear resistance
  • Revolutionary surface air gap firing technology featuring Bosch's unique four ground electrode design delivers the most powerful spark for the most efficient combustion and optimum horsepower without increasing the voltage requirement
  • Four yttrium enhanced ground electrodes resist spark plug wear and oxidation for exceptional performance life
  • Factory pre-set gap allows for easy installation of this HGR9DQI that never requires adjustment
  • Fusion's voltage requirement increases less over time versus other iridium plugs for longer reliable performance of the vehicle's ignition system
Autolite 3923 Copper Resistor...
  • Copper-glass seal bonds insulator, terminal post, and center electrode together to provide a tight seal that is 100 percent leak-proof
  • Cold-formed steel shell and precision rolled threads, with one-piece terminal post to add strength
  • Multi-rib insulator reduces danger of "flash-over"
  • Resistor reduces radio frequency interference (RFI) and electrode erosion
  • Full copper core electrode provides better performance in all conditions
NGK (6502) IFR5L-11 Laser...
  • Designed to operate over a much wider heat range than ordinary plugs
  • Resists carbon buildup and pre-ignition
  • High alumina ceramics for better heat transfer and electrical insulation
  • Solid copper core and nickel tipped electrode provide a longer plus life
  • Patented triple gasket sealing process eliminates the possibility of combustion gas leakage
Denso (4504) PK20TT Platinum...
  • Twin-tip technology with 11 mm platinum center electrode and 11 mm titanium enhanced ground electrode
  • Improve fuel economy, better acceleration and faster starts than all other single platinum plugs
  • Purified alumina powder insulator provides exceptional dielectric strength and thermal conductivity, allowing the material to stand up to extreme stress
  • Purified alumina powder insulator provides exceptional dielectric strength and thermal conductivity, allowing the material to stand up to extreme stress
  • Latest technology laser multi-spark plug, 14mm thread, 18mm (.708") reach, tapered seat, 5/8" hex
  • Designed to replace factory installed spark plugs in auto, motorcycle, ATV and marine applications
  • Ability to fire multiple sparks with standard factory ignition system
  • Fire in 360degree at place of best air/fuel mixture-spark not confined in one predetermined location
  • Better utilization of available combustion energy - better performance and fuel utilization
Bosch 6701 Platinum Spark Plug...
  • Platinum firing pin and yttrium enhanced ground electrode provide 2X longer service life compared to standard copper plugs
  • Fine wire design provides better ignitability and performance
  • 360° continuous laser welding to fuse the platinum firing pin for increased durability
  • 4 year performance satisfaction guarantee
  • Original equipment, pre-gapped replacement delivering optimum fit, form and function
Autolite APP104 Double...
  • Full platinum tips ensure virtually no gap erosion
  • Works to optimize engine performance for a longer life and improved fuel economy
  • Necked-down center electrode fires quicker and cleaner, with less voltage for easier starts and quicker acceleration
  • High nickel alloy side electrode maintains precise gap
  • Full copper core electrode provides better performance in all conditions
NGK (5464) BKR5EIX-11 Iridium...
  • Designed specifically for the performance enthusiast, Iridium IX offers extreme ignitability, improved throttle response and superior anti-fouling
  • The 0.6mm laser welded fine Iridium tip ensures high durability and a consistently stable spark and the tapered ground electrode minimizes electrical quenching effect
  • Longer insulator nose prevents fouling, the corrugated ribs on insulator prevents flashover, and a triple gasket seal eliminates combustion gas leakage. Copper core aids in heat removal
  • Iridium alloy has extremely high melting point, giving it high durability to heat and electrical wear, perfect for today's high-performance engines
  • Trivalent metal plating has superior anti-corrosion and anti-seizing properties
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