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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug BR7ES (5122)

SKU: GB-BR7ES

$8.80
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The NGK BR7ES (Stock No. 5122) is a standard resistor-type nickel spark plug used in selected marine and outboard applications. Featuring a copper-core centre electrode, M14 × 1.25 thread, 19 mm reach and 0.8 mm preset gap, it provides reliable ignition, efficient heat transfer and electrical-noise suppression. Its long-reach gasket-seat design must only be used in engines specifically requiring BR7ES.

Key benefits

Key Benefits

  • - Resistor-type spark plug to help suppress electrical and radio interference
  • - Copper-core centre electrode for efficient heat dissipation
  • - Standard nickel centre and ground electrodes
  • - NGK heat range 7
  • - 0.8 mm / 0.032" nominal gap
  • - Long 19 mm / 3/4" reach
  • - Flat gasket-seat design
  • - Corrosion-resistant plated shell
  • - Suitable for selected marine/outboard engines requiring BR7ES

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: BR7ES
  • - NGK Stock Number: 5122
  • - Spark Plug Type: Standard resistor
  • - Thread Diameter: 14 mm / 0.551"
  • - Thread Size: M14 × 1.25
  • - Thread Pitch: 1.25 mm / 0.049"
  • - Thread Reach: 19 mm / 0.750"
  • - Hex / Spanner Size: 20.8–21 mm / 13/16"
  • - Spark Gap: 0.8 mm / 0.032"
  • - NGK Heat Range: 7
  • - Seat Type: Flat / gasket
  • - Resistor: Yes – approximately 5 kΩ
  • - Centre Electrode: Nickel with copper core
  • - Centre Electrode Type: Standard, non-projected
  • - Centre Electrode Diameter: 2.5 mm
  • - Ground Electrode: Nickel
  • - Ground Electrodes: 1
  • - Insulator Height: approximately 55 mm / 2.17"
  • - Terminal: Removable nut

Compatible Outboard Motors

  • The important point with BR7ES is its 19 mm reach. It should not be confused with the much shorter BR7HS / BR7HS-10, which have a 12.7 mm reach.
  • Verified marine cross-reference data identifies BR7ES with Evinrude/Johnson/OMC 509575.

Evinrude / Johnson / OMC

  • - Selected Evinrude outboard applications specifying OEM 509575
  • - Selected Johnson outboard applications specifying OEM 509575
  • - Selected OMC marine applications specifying 0509575 / 509575

Mercury / Mariner

  • - Selected Mercury marine applications specifying 33-104
  • - Selected Mercury marine applications specifying 104
  • - Selected Mariner applications where the Mercury 33-104 specification applies

Yamaha

  • - Selected Yamaha marine applications specifying BR7-ES000-00-00

Cross-Reference / OEM Part Numbers

  • - NGK: BR7ES
  • - NGK Stock No.: 5122
  • - Evinrude / Johnson / OMC: 509575
  • - Evinrude / Johnson / OMC: 0509575
  • - Mercury Marine: 33-104
  • - Mercury Marine: 104
  • - Yamaha Marine: BR7-ES000-00-00 Marine Engine

Important Fitment Information

  • BR7ES is not the same spark plug as BR7HS or BR7HS-10.
  • - BR7ES: 19 mm / 3/4" reach
  • - BR7HS: 12.7 mm / 1/2" reach
  • - BR7HS-10: 12.7 mm / 1/2" reach with 1.0 mm nominal gap
  • The E in BR7ES identifies the longer 19 mm thread reach. Installing a long-reach BR7ES in an engine designed for a short-reach BR7HS can result in excessive thread protrusion into the combustion chamber and possible engine damage.

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough or unstable idle
  • - Engine misfire
  • - Reduced power
  • - Poor acceleration
  • - Increased fuel consumption
  • - Carbon or oil fouling
  • - Worn or rounded electrodes
  • - Excessive electrode gap
  • - Corrosion around the plug body
  • - Cracked or damaged ceramic insulator

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