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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug BPR5EFS (2223)

SKU: GB-BPR5EFS

$8.80
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The NGK BPR5EFS (Stock No. 2223) is a projected-tip resistor spark plug used primarily in selected MerCruiser and other GM-based marine petrol engines. Its tapered-seat design, copper-core nickel electrode and built-in resistor provide dependable ignition and efficient heat transfer. With an M14 × 1.25 thread, 17.5 mm reach and 16 mm hex, BPR5EFS is designed for engines specifically requiring this tapered-seat configuration.

Key benefits

Key Benefits

  • - Standard NGK resistor spark plug
  • - Suitable for selected petrol marine inboard and sterndrive engines
  • - Projected centre electrode
  • - Copper-core construction
  • - Nickel centre and ground electrodes
  • - Built-in resistor helps reduce electrical interference
  • - M14 × 1.25 thread
  • - 17.5 mm / 0.689" reach
  • - Compact 16 mm / 5/8" hex
  • - NGK heat range 5
  • - Tapered seat — no sealing washer

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: BPR5EFS
  • - NGK Stock Number: 2223
  • - 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: 17.5 mm / 0.689"
  • - Hex / Spanner Size: 16 mm / 5/8"
  • - NGK Heat Range: 5
  • - Typical Gap: approximately 0.8 mm / 0.031" before application-specific adjustment
  • - Seat Type: Tapered / conical
  • - Sealing Washer: No
  • - Resistor: Yes
  • - Centre Electrode: Nickel
  • - Centre Electrode Core: Copper
  • - Centre Electrode Type: Projected
  • - Ground Electrode: Nickel
  • - Ground Electrodes: 1

Compatible Marine Engines

  • MerCruiser
  • BPR5EFS is associated with selected GM-based MerCruiser sterndrive and inboard engines, particularly applications requiring the hotter NGK heat range 5 tapered-seat plug.
  • Depending on year, cylinder head and ignition system, applications can occur within selected
  • - MerCruiser 3.0L
  • - MerCruiser 4.3L V6
  • - MerCruiser 5.0L V8
  • - MerCruiser 5.7L V8
  • - MerCruiser 350 / 5.7L
  • - MerCruiser 7.4L / 454
  • - Selected MerCruiser MIE inboard configurations
  • However, these MerCruiser families used several different spark plugs during production. BPR5EFS should therefore be matched by engine serial number rather than horsepower or displacement alone.

Cross-Reference Spark Plugs & Part Numbers

  • - NGK: BPR5EFS
  • - NGK Stock No.: 2223
  • - Champion: selected RS-series tapered-seat plugs
  • Because marine GM engines can require different heat ranges despite using physically similar plugs, cross-reference numbers should be checked against the specific engine model and serial number before substitution.

Signs the Spark Plug Needs Replacing

  • - Difficult cold or hot starting
  • - Rough idle
  • - Engine misfire
  • - Hesitation under acceleration
  • - Loss of power
  • - Poor high-RPM operation
  • - Increased fuel consumption
  • - Carbon fouling
  • - Fuel or oil fouling
  • - Burned or rounded electrodes
  • - Corrosion
  • - Cracked ceramic insulator

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