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Marine & Outboard Spark Plugs

NGK V-Power Spark Plug LFR5A-11 (6376)

SKU: GB-LFR5A-11

$15.00
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The NGK LFR5A-11 (Stock No. 6376) is a long-reach resistor spark plug used across a wide range of Yamaha, Mercury and Marine Power four-stroke outboards. Featuring a nickel centre electrode, copper-core construction and projected firing end, it provides reliable ignition and efficient heat transfer. Its M14 × 1.25 thread, 26.5 mm reach, 16 mm hex and 1.1 mm gap suit many medium-to-high horsepower marine engines.

Key benefits

Key Benefits

  • - NGK Stock Number: 6376
  • - Standard nickel/copper-core construction
  • - Built-in resistor for electrical-noise suppression
  • - Projected firing end
  • - Long 26.5 mm / 1.043" reach
  • - M14 × 1.25 thread
  • - 16 mm / 5/8" hex
  • - 1.1 mm / 0.043" gap
  • - NGK heat range 5
  • - Flat/gasket seat
  • - Used extensively in Yamaha and selected Mercury four-stroke outboards
  • - Iridium upgrade LFR5AIX-11 – Stock No. 4469 is available for many of the same applications.

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: LFR5A-11
  • - NGK Stock Number: 6376
  • - Type: Standard resistor spark plug
  • - 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: 5
  • - Seat: Flat / gasket
  • - Resistor: Yes
  • - Centre Electrode: Nickel
  • - Centre Electrode Core: Copper
  • - Electrode Configuration: Projected
  • - Ground Electrodes: 1
  • - Sealing Washer: Yes
  • - Iridium Alternative: NGK LFR5AIX-11 – Stock No. 4469

Compatible Outboard Motors

  • Yamaha 75 HP
  • - Yamaha F75A – 75 HP, 4-stroke, 1596 cc – 2002–2004
  • - Yamaha F75B – 75 HP, 4-stroke, 1596 cc – 2005 onward
  • - Yamaha F75TLR – 75 HP – 2006–2010
  • - Gap: 1.1 mm
  • NGK lists LFR5AIX-11 Stock No. 4469 as the advanced iridium alternative.

Yamaha 80 HP

  • - Yamaha F80 – 80 HP – 1999–2002
  • - Yamaha F80C – 80 HP, 4-cylinder, 4-stroke, 1596 cc – 2009 onward
  • - Spark Plug: LFR5A-11
  • - Gap: 1.1 mm

Yamaha 90 HP

  • - Yamaha F90 – 90 HP four-stroke – 2003–2005
  • - Yamaha F90TJR – 2006–2010
  • - Yamaha F90TLR – 2006–2010
  • - Yamaha F90TXR – 2006–2010
  • - Gap: 1.1 mm

Yamaha 225 HP

  • - Yamaha LF225 – 2002–2005
  • - Yamaha LX225 – 2002–2003
  • - Yamaha F225TUR – 2006–2010
  • - Yamaha F225TXR – 2006–2010
  • - Yamaha LF225TUR – 2006–2010
  • - Yamaha LF225TXR – 2006–2010
  • - Gap: 1.1 mm
  • Other F225/FL225 variants use LFR6A-11, so the exact model suffix matters.

Yamaha 250 HP

  • - Yamaha F250 – selected production
  • - Yamaha LF250 – selected production
  • - LFR5A-11 – Stock No. 6376
  • - Gap: 1.1 mm

Mercury 90 HP FourStroke

  • - Mercury 90 HP
  • - 4-cylinder
  • - 4-stroke EFI
  • - 2000–2011
  • - LFR5A-11
  • - 14 mm thread
  • - 26.5 mm reach
  • - 16 mm hex
  • - 1.1 mm gap
  • For Mercury engines, the serial number should still be checked because Mercury changed spark-plug specifications between engine families. Mercury recommends identifying replacement parts using the engine serial number.

Cross-Reference / Related Part Numbers

  • - NGK: LFR5A-11
  • - NGK Stock No.: 6376
  • - NGK Iridium: LFR5AIX-11
  • - NGK Iridium Stock No.: 4469
  • - Yamaha: verify exact service number against model/year
  • - Mercury: verify exact service number against engine serial number
  • The iridium LFR5AIX-11 is specifically shown by NGK as the advanced alternative for numerous LFR5A-11 marine applications.

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough or unstable idle
  • - Engine misfire
  • - Hesitation during acceleration
  • - Reduced power
  • - Poor high-RPM performance
  • - Increased fuel consumption
  • - Carbon or fuel deposits
  • - Worn electrodes
  • - Excessive electrode gap
  • - Corrosion
  • - Cracked ceramic insulator

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