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Marine & Outboard Spark Plugs

NGK Iridium IX Spark Plug LFR6AIX-11 (6619)

SKU: GB-LFR6AIX-11

$32.40
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The NGK LFR6AIX-11 (Stock No. 6619) is an Iridium IX resistor spark plug designed as a high-performance alternative to LFR6A-11 in many compatible marine engines. Its 0.6 mm fine-wire iridium centre electrode provides excellent ignitability, reduced electrode wear and reliable combustion. With an M14 × 1.25 thread, 26.5 mm reach, 16 mm hex and 1.1 mm gap, it suits numerous Yamaha four-stroke outboards.

Key benefits

Key Benefits

  • - NGK Stock Number: 6619
  • - Iridium IX construction
  • - 0.6 mm fine-wire iridium centre electrode
  • - Excellent resistance to spark erosion
  • - Improved ignitability compared with conventional nickel electrodes
  • - Promotes reliable flame-front development
  • - Built-in resistor
  • - Projected firing-end configuration
  • - Long 26.5 mm / 1.043" reach
  • - M14 × 1.25 thread
  • - 16 mm / 5/8" hex
  • - 1.1 mm / 0.043" nominal gap
  • - NGK heat range 6

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: LFR6AIX-11
  • - NGK Stock Number: 6619
  • - Series: Iridium IX
  • - Thread Diameter: 14 mm / 0.551"
  • - Thread Size: M14 × 1.25
  • - Thread Reach: 26.5 mm / 1.043"
  • - Hex / Spanner Size: 16 mm / 5/8"
  • - Spark Gap: 1.1 mm / 0.043"
  • - NGK Heat Range: 6
  • - Seat: Flat / gasket
  • - Resistor: Yes
  • - Centre Electrode: Iridium
  • - Centre Electrode Diameter: 0.6 mm / 0.024"
  • - Centre Electrode Core: Copper
  • - Firing End: Projected
  • - Ground Electrodes: 1
  • - Sealing Washer: Yes

Compatible Outboard Motors

  • Yamaha 115 HP Four-Stroke
  • - Yamaha F115TJR
  • - Yamaha F115TLR
  • - Yamaha F115TXR
  • - 2006–2010
  • - 4-stroke
  • - Standard plug: LFR6A-11
  • - Iridium upgrade: LFR6AIX-11 – Stock 6619

Yamaha 200 HP Four-Stroke

  • - Yamaha FL200C
  • - 200 HP
  • - V6 EFI
  • - 3352 cc
  • - 4-stroke
  • - Listed from 2007
  • - Standard: LFR6A-11
  • - Advanced: LFR6AIX-11 – Stock 6619 Ngkntk
  • This V6 engine requires 6 spark plugs for a complete replacement set.

Yamaha 225 HP Four-Stroke

  • - Yamaha F225TLR
  • - 225 HP
  • - 2006–2010
  • - Standard plug: LFR6A-11
  • - Advanced plug: LFR6AIX-11
  • - NGK Stock No. 6619

Yamaha 250 HP Four-Stroke

  • - Yamaha FL250A
  • - 250 HP
  • - V6 EFI
  • - 3352 cc
  • - 4-stroke
  • - Listed from 2005

Also confirmed

  • - Yamaha F250B
  • - 250 HP
  • - V6 EFI
  • - 3352 cc
  • - 2008–2010
  • - Yamaha F250BTUR
  • - Yamaha F250BTXR
  • - 2006–2010
  • - Yamaha LF250TUR
  • - Yamaha LF250TXR
  • - 2006–2010

Yamaha 300 HP Four-Stroke

  • Yamaha F300B
  • - F300B
  • - 300 HP
  • - V6 EFI
  • - 4169 cc
  • - Four-stroke
  • - Listed from 2010
  • - LFR6AIX-11 – Stock 6619

Yamaha FL300B

  • - FL300B
  • - 300 HP
  • - V6 EFI
  • - 4169 cc
  • - Four-stroke
  • - Listed from 2008 in NGK's application data
  • - LFR6AIX-11 – Stock 6619

Yamaha F300A V8

  • - F300A
  • - 300 HP
  • - V8 MPFI
  • - 5330 cc
  • - Four-stroke
  • - Listed from 2008
  • - Standard: LFR6A-11
  • - Advanced: LFR6AIX-11 – Stock 6619
  • The V6 versions normally require 6 plugs, while the V8 versions require 8 plugs.

Cross-Reference / Related Part Numbers

  • - NGK: LFR6AIX-11
  • - NGK Stock No.: 6619
  • - Standard NGK equivalent/application plug: LFR6A-11
  • - LFR6A-11 Stock No.: 3672

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 deposits
  • - Fuel or oil fouling
  • - Excessive electrode wear
  • - Enlarged electrode gap
  • - Corrosion
  • - Cracked ceramic insulator
  • - Damaged sealing washer

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