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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug BR9ES (5722)

SKU: GB-BR9ES

$8.80
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The NGK BR9ES (Stock No. 5722) is a resistor-type nickel spark plug designed for engines requiring a colder NGK heat range 9 plug. Featuring an M14 × 1.25 thread, 19 mm reach and 0.8 mm nominal gap, it combines a copper-core centre electrode with resistor suppression for dependable ignition and reduced electrical interference. BR9ES is used in selected high-performance 2-stroke marine and other engine applications where this exact specification is required.

Key benefits

Key Benefits

  • - Resistor-type spark plug
  • - Helps suppress radio-frequency and ignition interference
  • - Standard nickel electrode construction
  • - Copper-core centre electrode for efficient heat transfer
  • - Colder NGK heat range 9
  • - Long 19 mm / 3/4" reach
  • - 0.8 mm / 0.032" nominal gap
  • - Flat / gasket seat
  • - Standard non-projected electrode
  • - Suitable for marine engines specifically specifying BR9ES

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: BR9ES
  • - NGK Stock Number: 5722
  • - 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: 19.0 mm / 0.748"
  • - Hex / Spanner Size: 20.8 mm / 13/16"
  • - Nominal Spark Gap: 0.8 mm / 0.032"
  • - NGK Heat Range: 9
  • - Seat Type: Flat / gasket
  • - Resistor: Yes
  • - Resistance: approximately 5 kΩ
  • - Electrode Configuration: Standard / non-projected
  • - Centre Electrode: Nickel alloy with copper core
  • - Ground Electrode: Nickel alloy
  • - Number of Ground Electrodes: 1

Compatible Marine & Outboard Engines

  • Mercury Outboards
  • BR9ES is listed for selected Mercury 2-stroke/high-performance marine applications. Exact engine identification is essential because Mercury commonly used several different plugs across engines of the same horsepower.
  • - Mercury 75 HP 2-stroke
  • - Mercury 90 HP 2-stroke
  • - Mercury 100 HP 2-stroke
  • - Mercury 115 HP 2-stroke
  • - Mercury 125 HP 2-stroke
  • - Mercury 135 HP V6
  • - Mercury 150 HP V6
  • - Mercury 175 HP V6
  • - Mercury 200 HP V6
  • These horsepower ranges should not be treated as universal BR9ES fitment. Model, serial number and ignition specification must be checked.

Mariner Outboards

  • Selected Mercury-derived Mariner engines may also specify BR9ES, particularly certain larger 2-stroke engines.
  • - Mariner 75 HP
  • - Mariner 90 HP
  • - Mariner 100 HP
  • - Mariner 115 HP
  • - Mariner 135 HP
  • - Mariner 150 HP
  • - Mariner 175 HP
  • - Mariner 200 HP
  • Again, exact model/year verification is required.

Cross-Reference Spark Plugs

  • - NGK: BR9ES
  • - NGK Stock No.: 5722
  • - NGK Iridium: BR9EIX – related Iridium specification; verify application before substitution

Important Fitment Information

  • BR9ES must not be confused with BR8ES, BR9HS or BR9HS-10.
  • The NGK code identifies several critical differences
  • - B – 14 mm thread
  • - R – resistor
  • - 9 – NGK heat range 9
  • - E – 19 mm / 3/4" thread reach
  • - S – standard electrode design
  • BR9ES
  • - Heat range: 9
  • - Reach: 19 mm
  • - Resistor: Yes
  • - Nominal gap: 0.8 mm
  • The 19 mm reach is particularly important. Never substitute BR9ES for a short-reach BR9HS/BR9HS-10 solely because the thread diameter and heat range are the same.

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Engine misfire
  • - Rough or unstable idle
  • - Reduced engine power
  • - Poor acceleration
  • - Excessive fuel consumption
  • - Heavy carbon deposits
  • - Oil fouling
  • - Overheated or damaged electrode
  • - Worn or rounded electrodes
  • - Excessive electrode gap
  • - Cracked ceramic insulator
  • - Corrosion around the plug body

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