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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug BPR5ES (7422)

SKU: GB-BPR5ES

$8.80
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The NGK BPR5ES (Stock No. 7422) is a standard projected-tip resistor spark plug used in selected Honda four-stroke outboards and a range of marine inboard engines. Featuring a nickel electrode and copper-core construction, it provides reliable ignition and efficient heat transfer. Its M14 × 1.25 thread, 19 mm reach, 20.8 mm hex and 0.9 mm gap suit engines specifically specifying BPR5ES.

Key benefits

Key Benefits

  • - NGK Stock No. 7422
  • - Confirmed Honda outboard applications
  • - Standard resistor-type spark plug
  • - Projected centre electrode
  • - Nickel electrode with copper-core construction
  • - Built-in resistor helps reduce electrical interference
  • - M14 × 1.25 thread
  • - 19 mm / ¾" reach
  • - NGK heat range 5
  • - Flat gasket seat
  • - Iridium alternative available as BPR5EIX – Stock No. 6597

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: BPR5ES
  • - NGK Stock Number: 7422
  • - Thread Diameter: 14 mm / 0.551"
  • - Thread Size: M14 × 1.25
  • - Thread Reach: 19 mm / 0.748"
  • - Hex / Spanner Size: 20.8 mm / 13/16"
  • - Nominal Spark Gap: 0.9 mm / 0.035"
  • - NGK Heat Range: 5
  • - Seat Type: Flat / gasket
  • - Resistor: Yes
  • - Centre Electrode: Nickel
  • - Centre Electrode Core: Copper
  • - Electrode Configuration: Projected
  • - Ground Electrodes: 1

Compatible Outboard Motors

  • Honda Outboards
  • - Honda BF4.5 – 4.5 HP
  • - Honda BF4.5D – 4.5 HP
  • - Honda BF5 – 5 HP
  • - Honda BF5A – 5 HP, 1-cylinder 4-stroke
  • - Honda BF5A2 – 5 HP, 1-cylinder 127 cc 4-stroke
  • - Honda BF5A4 – 5 HP, 1-cylinder 127 cc 4-stroke
  • - Honda BF5AK2 – 5 HP, 1-cylinder 127 cc 4-stroke
  • - Honda BF5DK2SB – 5 HP, 1-cylinder 127 cc 4-stroke
  • - Honda BF50 – 5 HP designation in NGK catalogue, 1-cylinder 4-stroke SOHV
  • - Honda BF50F – 50 HP, 3-cylinder 4-stroke SOHC
  • NGK's current part finder specifically confirms BF4.5 and BF5 applications, while its consolidated BPR5ES listing includes the additional Honda model variants above.

Compatible Marine Inboard Engines

  • - Barr Chevrolet 194/230 CID – 1962–1969
  • - Barr Chevrolet 250 CID – 1962–1969
  • - Chevrolet Marine Conversion 194 CID – 1962–1969
  • - Chevrolet Marine Conversion 230 CID – 1962–1969
  • - Chevrolet Marine Conversion 250 CID – 1962–1969
  • - Marinetek 318 CID – 1975–1988
  • - Marinetek 360 CID – 1975–1988
  • - Panther F185 – 1976–1980
  • - Panther F235 – 1976–1980

Cross-Reference Spark Plugs

  • - NGK: BPR5ES
  • - NGK Stock No.: 7422
  • - NGK Iridium: BPR5EIX
  • - NGK BPR5EIX Stock No.: 6597
  • - Champion: OE051

Important Fitment Information

  • Do not confuse BPR5ES with BPR5EFS. They are physically different spark-plug configurations.
  • BPR5ES
  • - Stock No. 7422
  • - 14 mm thread
  • - 19 mm reach
  • - 20.8 mm / 13/16" hex
  • - Flat gasket seat
  • - Heat range 5
  • BPR5EFS
  • - Stock No. 2223
  • - Different tapered-seat configuration
  • They should not be interchanged simply because both are NGK heat range 5 plugs.

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough or unstable idle
  • - Engine misfire
  • - Hesitation during acceleration
  • - Reduced engine power
  • - Increased fuel consumption
  • - Carbon deposits
  • - Fuel or oil fouling
  • - Excessive electrode wear
  • - Corrosion
  • - Cracked ceramic insulator

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