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Marine & Outboard Spark Plugs

NGK Laser Iridium Spark Plug IZFR5J (5899)

SKU: GB-IZFR5J

$44.40
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The NGK IZFR5J (Stock No. 5899) is a premium Laser Iridium resistor spark plug designed for selected high-performance marine engines, including Mercury Optimax and Evinrude E-TEC outboards. It features a fine-wire iridium centre electrode, platinum ground electrode, extended projection and 0.8 mm factory gap, providing dependable ignition, excellent durability and resistance to electrode wear in demanding marine applications.

Key benefits

Key Benefits

  • - Correct NGK Stock Number: 5899
  • - Laser Iridium construction
  • - Fine-wire iridium centre electrode
  • - Platinum ground electrode
  • - Excellent electrode wear resistance
  • - Extended projection design
  • - Built-in resistor – approximately 5 kΩ
  • - 0.8 mm / 0.032" factory gap
  • - NGK heat range 5
  • - Flat gasket seat
  • - Used in selected Mercury Optimax and Evinrude E-TEC outboards

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: IZFR5J
  • - NGK Stock Number: 5899
  • - Type: Laser Iridium
  • - Thread Diameter: 14 mm / 0.551"
  • - Thread Size: M14 × 1.25
  • - Thread Reach: 19 mm / 0.750"
  • - Hex / Spanner Size: 16 mm / 5/8"
  • - Factory Gap: 0.8 mm / 0.032"
  • - NGK Heat Range: 5
  • - Seat: Flat / gasket
  • - Resistor: Yes – approximately 5 kΩ
  • - Centre Electrode: Fine-wire iridium
  • - Centre Electrode Core: Copper
  • - Ground Electrode: Platinum tipped
  • - Ground Electrode Configuration: J-gap
  • - Centre Electrode Projection: Extra-long
  • - Terminal: Non-removable/solid nut
  • - Sealing Washer: Yes

Compatible Outboard Motors

  • Mercury Optimax
  • - Mercury 75 HP Optimax – 2006 onward
  • - Mercury 90 HP Optimax – 2006 onward
  • Both applications specify a 0.8 mm gap.

Evinrude E-TEC

  • - Evinrude E-TEC 115 HP – 2005 onward
  • - Evinrude E-TEC 175 HP – selected 2006 onward applications
  • The 115 HP E-TEC application specifies IZFR5J 5899 with a 0.8 mm gap.

Johnson / Evinrude

  • Australian marine application data additionally lists IZFR5J for selected Johnson/Evinrude applications from approximately 2007 onward.

Tohatsu

  • - Tohatsu 9701-1-1109

Cross-Reference Part Numbers

  • - NGK: IZFR5J
  • - NGK Stock No.: 5899
  • - Mercury: 33-892567
  • - Mercury / Quicksilver: 33-892567Q
  • - Mercury: 33-892567001
  • - Mercury: 8M0058935
  • - Tohatsu: 9701-1-1109
  • - Champion: 9034

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough idle
  • - Engine misfire
  • - Poor acceleration
  • - Loss of power
  • - Poor high-RPM operation
  • - Increased fuel consumption
  • - Carbon or fuel fouling
  • - Electrode erosion
  • - Corrosion
  • - Cracked ceramic insulator

Shipping

Ships Australia-wide