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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug BR6HS (3922)

SKU: GB-BR6HS

$8.80
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The NGK BR6HS (Stock No. 3922) is a standard resistor spark plug suited to numerous 2-stroke marine and outboard applications. It features an M14 × 1.25 thread, 12.7 mm reach, heat range 6 and nominal 0.7 mm gap. Its nickel electrode and resistor construction provide dependable ignition while helping reduce electrical interference with ignition and marine electronics. It is used in selected Mariner, Johnson, Evinrude and other marine engines.

Key benefits

Key Benefits

  • - Resistor-type construction helps suppress electrical/RFI interference
  • - Standard nickel electrode
  • - NGK heat range 6
  • - Short 12.7 mm / 1/2" reach
  • - M14 × 1.25 thread
  • - Flat gasket seat
  • - Standard non-projected firing end
  • - Suitable for numerous 2-stroke marine engines
  • - Direct replacement where BR6HS is specified
  • - BR6HIX is NGK's corresponding Iridium option for many BR6HS applications.

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: BR6HS
  • - NGK Stock Number: 3922
  • - Spark Plug Type: Standard resistor
  • - Thread Diameter: 14.0 mm / 0.551"
  • - Thread Size: M14 × 1.25
  • - Thread Pitch: 1.25 mm / 0.049"
  • - Thread Reach: 12.7 mm / 0.500"
  • - Hex / Spanner Size: 20.8 mm / 13/16"
  • - Nominal Gap: 0.7 mm / 0.028"
  • - NGK Heat Range: 6
  • - Seat Type: Flat / gasket
  • - Resistor: Yes
  • - Electrode Material: Nickel
  • - Electrode Configuration: Standard / non-projected
  • - Terminal: Thread/removable-type terminal depending on market packaging

Compatible Outboard Motors

  • Mariner Outboards
  • - Mariner 2A – model code 646 – all serial numbers
  • - Mariner 2B – model code 6A1 – serial 000101–011600
  • - Mariner 3.5 – model code 642 – serial 23741 and above
  • - Mariner 3.5 Long Shaft – model code 642 – serial 41691 and above
  • The Mercury/Mariner chart specifies B6HS as the standard plug and BR6HS as the suppressor plug, with Mercury part number 33-813472.

Evinrude Outboards

  • - Evinrude 3 HP, 2-cylinder – 1989–1997
  • - Evinrude 4.5 HP – 1980–1985
  • - Evinrude 5 HP, 14 mm plug – 1990–1997
  • - Evinrude 6 HP, 2-stroke – 1977–1998
  • - Evinrude 6.5 HP Commercial – 1981–1993
  • - Evinrude 7.5 HP – 1977–1997
  • - Evinrude 8 HP Commercial – 1977–1998

Johnson Outboards

  • - Johnson 100 HP CV4 – 1979–1997
  • NGK specifies the 14 mm thread, 12.7 mm reach and 0.7 mm gap for this application.

Cross-Reference / OEM Part Numbers

  • - NGK: BR6HS
  • - NGK Stock No.: 3922
  • - NGK Iridium: BR6HIX – Stock No. 3419
  • - Mercury / Mariner: 33-813472
  • - Champion: QL7J5
  • - Champion: QL82C
  • - Champion: QL86
  • - Champion: QL86C
  • - Champion: RL82C
  • - Champion: RL86C

Important Fitment Information

  • BR6HS is different from B6HS and BR6HS-10.
  • - B6HS – non-resistor, heat range 6, 12.7 mm reach
  • - BR6HS – resistor, heat range 6, 12.7 mm reach
  • - BR6HS-10 – resistor, heat range 6, 12.7 mm reach, supplied to a 1.0 mm nominal gap
  • The NGK code means
  • - B – 14 mm thread
  • - R – resistor
  • - 6 – NGK heat range 6
  • - H – 12.7 mm / 1/2" reach
  • - S – standard firing end
  • Note that the engine manufacturer's specified installed gap can differ from the nominal plug specification. For example, Mercury's early Mariner chart specifies BR6HS at 0.024" (about 0.6 mm) for the listed 2A, 2B and 3.5 applications. Always use the engine-specific service specification when setting the final gap.

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough or unstable idle
  • - Intermittent misfire
  • - Reduced engine power
  • - Poor acceleration
  • - Excessive fuel consumption
  • - Carbon fouling
  • - Oil fouling
  • - Worn or rounded electrodes
  • - Excessive electrode gap
  • - Corrosion around the plug shell
  • - Cracked or damaged ceramic insulator

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