Back to catalogue
Marine & Outboard Spark Plugs

NGK Laser Iridium Spark Plug IZFR6Q (91234)

SKU: GB-IZFR6Q

$44.30
Request a quote

The NGK IZFR6Q (Stock No. 6908 / 91234-1) is a premium Laser Iridium resistor spark plug designed for selected Tohatsu TLDI direct-injection two-stroke outboards, particularly MD75 and MD90 models. Featuring a fine-wire iridium centre electrode and platinum ground electrode, it provides dependable ignition, excellent fouling resistance and extended service life. Its M14 × 1.25 thread, 19 mm reach and 16 mm hex are engineered for demanding marine applications.

Key benefits

Key Benefits

  • - NGK Stock Number: 6908
  • - Laser Iridium construction
  • - Fine-wire iridium centre electrode
  • - Platinum ground electrode
  • - Excellent ignition performance
  • - High resistance to electrode wear
  • - Built-in resistor for electrical-noise suppression
  • - NGK heat range 6
  • - M14 × 1.25 thread
  • - 19 mm / 0.750" reach
  • - 16 mm / 5/8" hex
  • - Flat/gasket seat
  • - Designed for selected Tohatsu TLDI direct-injection two-stroke outboards

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: IZFR6Q
  • - NGK Stock Number: 6908
  • - Type: Laser Iridium
  • - Thread Diameter: 14 mm / 0.551"
  • - Thread Size: M14 × 1.25
  • - Thread Pitch: 1.25 mm / 0.049"
  • - Thread Reach: 19 mm / 0.750"
  • - Hex / Spanner Size: 16 mm / 5/8"
  • - NGK Heat Range: 6
  • - Seat Type: Flat / gasket
  • - Resistor: Yes
  • - Centre Electrode: Fine-wire iridium
  • - Centre Electrode Core: Copper
  • - Ground Electrode: Platinum tipped
  • - Ground Electrodes: 1
  • - Electrode Configuration: Projected
  • - Terminal: Solid
  • - Sealing Washer: Yes

Compatible Outboard Motors

  • Tohatsu TLDI Outboards
  • - Tohatsu MD75C2 – 75 HP TLDI
  • - Tohatsu MD90C2 – 90 HP TLDI
  • These are three-cylinder, direct fuel-injected two-stroke outboards using Tohatsu's TLDI – Two-stroke Low-pressure Direct Injection system.

The Tohatsu TLDI range uses several visually similar NGK plugs, so the exact model designation is important

  • - MD40 / MD50B → NGK PZFR6H
  • - MD40B2 → NGK IZFR6J
  • - MD50B2 → NGK IZFR6J
  • - MD70B → NGK IZFR6J
  • - MD90B → NGK IZFR6J
  • - MD75C2 → NGK IZFR6Q
  • - MD90C2 → NGK IZFR6Q
  • - MD115A / MD115A2 → NGK IZFR5J
  • Therefore, IZFR6J and IZFR6Q should not be treated as interchangeable simply because both are used in 75–90 HP TLDI-family engines.

Cross-Reference Part Numbers

  • - NGK: IZFR6Q
  • - NGK Stock No.: 6908
  • - Tohatsu: 9701-1-1111
  • - Tohatsu: 97011-1111M
  • - Tohatsu replacement/service reference: verify against engine serial number before ordering

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough or unstable idle
  • - Engine misfire
  • - Hesitation under acceleration
  • - Reduced engine power
  • - Poor high-RPM performance
  • - Excessive fuel consumption
  • - Carbon deposits
  • - Fuel or oil fouling
  • - Electrode erosion
  • - Corrosion
  • - Cracked ceramic insulator
  • - Repeated ignition faults

Shipping

Ships Australia-wide