Back to catalogue
Marine & Outboard Spark Plugs

NGK Nickel Spark Plug BR8ES (5422)

SKU: GB-BR8ES

$8.80
Request a quote

The NGK BR8ES (Stock No. 5422) is a standard resistor-type nickel spark plug used in selected 2-stroke marine and outboard engines. Featuring an M14 × 1.25 thread, 19 mm reach and 0.8 mm gap, its copper-core centre electrode provides efficient heat transfer and dependable ignition. The resistor design helps suppress electrical interference, while the long-reach gasket-seat construction suits engines specifically requiring the BR8ES specification.

Key benefits

Key Benefits

  • - Resistor-type spark plug for reduced electrical/RFI interference
  • - Standard nickel electrode construction
  • - Copper-core centre electrode for efficient heat transfer
  • - NGK heat range 8
  • - 0.8 mm / 0.032" nominal electrode gap
  • - Long 19 mm / 3/4" thread reach
  • - Flat / gasket seat
  • - Standard non-projected electrode
  • - Suitable for selected 2-stroke marine engines
  • - Direct replacement where BR8ES is specified

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: BR8ES
  • - NGK Stock Number: 5422
  • - 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"
  • - Spark Gap: 0.8 mm / 0.032"
  • - NGK Heat Range: 8
  • - Seat Type: Flat / gasket
  • - Resistor: Yes
  • - Resistance: approximately 5 kΩ
  • - Electrode Type: Standard / non-projected
  • - Centre Electrode: Nickel alloy with copper core
  • - Centre Electrode Diameter: approximately 2.5 mm
  • - Ground Electrode: Nickel alloy
  • - Number of Ground Electrodes: 1

Compatible Outboard Motors

  • Mercury Outboards
  • BR8ES is specified for selected Mercury 2-stroke applications. Exact model and serial-number confirmation is important because Mercury used several different spark-plug types across engines of similar horsepower.
  • - Mercury 40 HP – selected 2-stroke models
  • - Mercury 50 HP – selected 2-stroke models
  • - Mercury 60 HP – selected 2-stroke models
  • - Mercury 70 HP – selected models
  • - Mercury 75 HP – selected 2-stroke models
  • - Mercury 80 HP – selected models
  • - Mercury 90 HP – selected models
  • - Mercury 100 HP – selected models
  • - Mercury 115 HP – selected models

Mariner Outboards

  • - Mariner 40 HP
  • - Mariner 50 HP
  • - Mariner 60 HP
  • - Mariner 70 HP
  • - Mariner 75 HP
  • - Mariner 80 HP
  • - Mariner 90 HP
  • - Mariner 100 HP
  • - Mariner 115 HP
  • Model code and production year should be confirmed before ordering.

Yamaha Outboards

  • BR8ES is also specified for selected Yamaha 2-stroke outboards, particularly certain larger-displacement engines. Depending on model and year, applications can include selected
  • - Yamaha 40 HP
  • - Yamaha 50 HP
  • - Yamaha 55 HP
  • - Yamaha 60 HP
  • - Yamaha 70 HP
  • - Yamaha 75 HP
  • - Yamaha 80 HP
  • - Yamaha 85 HP
  • - Yamaha 90 HP
  • - Yamaha 115 HP
  • - Yamaha 130 HP

Suzuki Outboards

  • Selected older Suzuki 2-stroke applications also use BR8ES or corresponding OEM specifications, including certain
  • - Suzuki DT40
  • - Suzuki DT50
  • - Suzuki DT55
  • - Suzuki DT60
  • - Suzuki DT65
  • - Suzuki DT75
  • - Suzuki DT85
  • Because Suzuki used both short- and long-reach plugs across the DT range, exact model/year verification is required.
  • Cross-Reference / OEM Part Numbers
  • - NGK: BR8ES
  • - NGK Stock No.: 5422
  • - Champion: comparable heat-range applications exist, but the exact OEM-specified cross-reference should be checked before substitution
  • - Mercury / Mariner: selected OEM marine applications
  • - Yamaha: selected OEM marine applications
  • - Suzuki: selected OEM marine applications

Important Fitment Information

  • BR8ES should not be confused with BR8HS or BR8HS-10.
  • The most important difference is thread reach
  • - BR8ES: 19 mm / 3/4" reach
  • - BR8HS: 12.7 mm / 1/2" reach
  • - BR8HS-10: 12.7 mm / 1/2" reach, nominal 1.0 mm gap
  • The NGK designation means
  • - B – 14 mm thread
  • - R – resistor
  • - 8 – NGK heat range 8
  • - E – 19 mm thread reach
  • - S – standard electrode
  • A BR8ES must not be installed in an engine designed for a short-reach BR8HS/BR8HS-10 merely because the plugs share the same thread diameter and heat range. The extra thread projection can enter the combustion chamber and may cause engine damage.

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough or unstable idle
  • - Engine misfire
  • - Loss of power
  • - Poor acceleration
  • - Increased fuel consumption
  • - Carbon fouling
  • - Oil fouling
  • - Worn or rounded electrodes
  • - Excessive electrode gap
  • - Corrosion around the plug shell
  • - Cracked ceramic insulator

Shipping

Ships Australia-wide