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Best Ceramic Insulator

6-Pack NGK Spark Plugs TR55 Stock # 3951

  • Trapezoid cut ground electrode reduces quenching.
  • Trivalent metal plating provides superior anti-corrosion and anti-seizing properties.
  • Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer.
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Performance Spark Plugs Pair for Softail Deuce 1999-2014 Models

  • Conventional style spark plugs, available in OEM heat ranges.
  • Plugs have a unique look with a black ceramic body.
  • Insulator is made of 95% pure alumina, features strong resistance to heat shock and superior insulation.
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Performance Spark Plugs Pair for Softail Deuce 1999-2014 Models

  • Conventional style spark plugs, available in OEM heat ranges.
  • Plugs have a unique look with a black ceramic body.
  • Insulator is made of 95% pure alumina, features strong resistance to heat shock and superior insulation.
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Performance Spark Plugs Pair for Softail Deuce 1999-2014 Models

  • Conventional style spark plugs, available in OEM heat ranges.
  • Plugs have a unique look with a black ceramic body.
  • Insulator is made of 95% pure alumina, features strong resistance to heat shock and superior insulation.
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NGK 6431 Standard Spark Plug - BU8H, 10 Pack

  • Trivalent metal plating provides superior anti-corrosion and anti-seizing properties.
  • Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer.
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NGK 3271 Spark Plug

  • Trivalent Metal Plating Provides Superior Anti-Corrosion and Anti-Seizing Properties.
  • Pure Alumina Silicate Ceramic Insulator, Provides Superior Strength and Better Heat Transfer.
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NGK 5019 Spark Plug

  • Trivalent metal plating provides superior anti-corrosion and anti-seizing properties.
  • Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer.
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NGK 6578 Spark Plugs (BPR4ES) - Pack of 2

  • Trivalent metal plating provides superior anti-corrosion and anti-seizing properties.
  • Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer.
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NGK 6737 Spark Plug Pack of 1

  • trivalent metal plating provides superior anti-corrosion and anti-seizing properties.
  • pure alumina silicate ceramic insulator, provides superior strength and better heat transfer.
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NGK (4302) BKR5EKPB-11 Laser Platinum Spark Plug, Pack of 1

  • You can depend on NGK for quality and reliability.
  • Features corrugated ribs, ceramic insulator, copper core and triple interior seal.
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NGK 4462 Laser Iridium Spark Plug - IZFR6J, 1 Pack

  • Tapered-cut ground electrode improves ignitability and reduces quenching.
  • 98% pure copper core increases heat dissipation for more reliable starts and prevents spark plug from overheating.
  • High-grade alumina silicate ceramic insulator for superior strength and heat transfer.
  • Iridium is six times more durable than platinum.
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Sportster Sport XL 1200S Performance Spark Plugs Pair repl. OEM# 6R12

  • Conventional style spark plugs, available in OEM heat ranges.
  • Plugs have a unique look with a black ceramic body.
  • Insulator is made of 95% pure alumina, features strong resistance to heat shock and superior insulation.
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NGK Spark Plug, NGK CR7E, ea, 1

  • 98% pure copper core increases heat dissipation for more reliable starts and prevents spark plug from overheating.
  • High-grade alumina silicate ceramic insulator for superior strength and heat transfer.
  • Cold-rolled threads to prevent cross-threading and damage to cylinder heads.
  • Trivalent plating eliminates need for anti-seize and corrugated ribs prevent flashover.
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