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Marine & Outboard Spark Plugs

NGK Laser Iridium Spark Plug IKR6G8 (95064)

SKU: GB-IKR6G8

$44.30
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The NGK IKR6G8 (Stock No. 95064) is a Laser Iridium resistor spark plug specified for selected Tohatsu four-stroke outboards, particularly later MFS40A, MFS50A and MFS60A engines. Its fine-wire iridium centre electrode provides reliable ignition, efficient combustion and excellent wear resistance. IKR6G8 features an M12 × 1.25 thread, 19 mm reach, 16 mm hex and 0.8 mm nominal gap for demanding marine use.

Key benefits

Key Benefits

  • - NGK Stock Number: 95064
  • - Laser Iridium construction
  • - Fine-wire iridium centre electrode
  • - Built-in resistor for electrical-noise suppression
  • - Excellent ignition and cold-start performance
  • - High resistance to electrode wear
  • - Suitable for selected fuel-injected Tohatsu four-stroke outboards
  • - 0.8 mm / 0.032" nominal NGK application gap
  • - NGK heat range 6
  • - M12 × 1.25 thread
  • - 19 mm / ¾" reach
  • - 16 mm / 5/8" hex
  • - Flat gasket seat

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: IKR6G8
  • - Current NGK Stock Number: 95064
  • - Type: Laser Iridium
  • - Thread Diameter: 12 mm / 0.472"
  • - Thread Size: M12 × 1.25
  • - Thread Reach: 19 mm / 0.750"
  • - Hex / Spanner Size: 16 mm / 5/8"
  • - Nominal Application Gap: 0.8 mm / 0.032"
  • - Tohatsu service gap: 0.7–0.8 mm / 0.028–0.031" for MFS40A/MFS50A/MFS60A
  • - NGK Heat Range: 6
  • - Seat Type: Flat / gasket
  • - Resistor: Yes
  • - Centre Electrode: Fine-wire iridium
  • - Ground Electrode: Nickel
  • - Ground Electrodes: 1

Compatible Outboard Motors

  • Tohatsu MFS40A – 40 HP
  • - MFS40A
  • - 40 HP
  • - 866 cc
  • - 3-cylinder
  • - 4-stroke
  • - 2016 onward
  • - Engine No. 046502AE onward
  • - IKR6G8
  • - Stock No. 95064
  • - 0.8 mm application gap Ngkntk
  • This serial break is important. NGK lists the earlier MFS40A through 2015 with DCPR6E Stock No. 3481, while the later engine changes to IKR6G8.

Tohatsu MFS50A – 50 HP

  • - MFS50A
  • - 50 HP
  • - 866 cc
  • - 3-cylinder
  • - 4-stroke
  • - 2016 onward
  • - Engine No. 000001AG onward
  • - IKR6G8
  • - Stock No. 95064
  • - 0.8 mm application gap Ngkntk
  • Earlier MFS50A engines through 2015 are listed with DCPR6E, so the production/serial break must be observed.

Tohatsu MFS60A – 60 HP

  • - MFS60A
  • - 60 HP
  • - 866 cc
  • - 3-cylinder
  • - 4-stroke
  • - IKR6G8
  • - Stock No. 95064
  • - 0.8 mm application gap Ngkntk
  • The Tohatsu MFS40A/MFS50A/MFS60A owner's manual specifies NGK IKR6G8 with a service gap of 0.7–0.8 mm (0.028–0.031").

Cross-Reference / Part Numbers

  • - NGK: IKR6G8
  • - NGK Stock Number: 95064
  • - Earlier NGK ordering number: 94367
  • - Tohatsu: 9701-1-1121

Important Fitment Information

  • For the MFS40A and MFS50A, the engine serial number is particularly important.
  • MFS40A
  • - Earlier version → DCPR6E
  • - From Engine No. 046502AE onward → IKR6G8
  • MFS50A
  • - Earlier version → DCPR6E
  • - From Engine No. 000001AG onward → IKR6G8
  • MFS60A
  • - NGK catalogue → IKR6G8
  • NGK's current catalogue lists the MFS60 with DCPR6E, whereas MFS60A is listed with IKR6G8.
  • For servicing, Tohatsu specifies a spark-plug gap of 0.7–0.8 mm (0.028–0.031") on the MFS40A/MFS50A/MFS60A family.

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough or unstable idle
  • - Engine misfire
  • - Hesitation during acceleration
  • - Reduced engine power
  • - Poor high-RPM performance
  • - Increased fuel consumption
  • - Carbon or fuel deposits
  • - Electrode erosion
  • - Corrosion
  • - Cracked ceramic insulator
  • - Damaged sealing washer

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