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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug BP5FS (3412)

SKU: GB-BP5FS

$8.80
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The NGK BP5FS (Stock No. 4111) is a standard non-resistor spark plug used in selected older marine inboard and sterndrive petrol engines. Featuring a nickel alloy centre electrode with copper core, projected-tip design and tapered seat, it provides reliable ignition and efficient heat transfer. BP5FS is commonly associated with selected MerCruiser, Volvo Penta and other GM-based marine engines requiring this specific short-reach plug.

Key benefits

Key Benefits

  • - Standard NGK nickel spark plug
  • - Copper-core centre electrode
  • - Efficient heat transfer
  • - Projected electrode design
  • - Non-resistor construction
  • - Tapered/conical seat
  • - No sealing washer required
  • - NGK heat range 5
  • - Suitable for selected older petrol marine engines

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: BP5FS
  • - NGK Stock Number: 4111
  • - Spark Plug Type: Standard non-resistor
  • - Thread Diameter: 14 mm / 0.551"
  • - Thread Size: M14 × 1.25
  • - Thread Pitch: 1.25 mm / 0.049"
  • - Thread Reach: approximately 11.2 mm / 0.441"
  • - Hex / Spanner Size: 16 mm / 5/8"
  • - Spark Gap: approximately 0.8 mm / 0.031" as supplied; check engine specification
  • - NGK Heat Range: 5
  • - Seat Type: Tapered / conical
  • - Resistor: No
  • - Centre Electrode: Nickel alloy
  • - Centre Electrode Core: Copper
  • - Electrode Type: Projected
  • - Ground Electrode: Nickel alloy
  • - Number of Ground Electrodes: 1
  • - Sealing Washer: None – tapered seat

Compatible Marine Engines

  • MerCruiser
  • - MerCruiser 120 HP
  • - MerCruiser 140 HP
  • - MerCruiser 2.5L
  • - MerCruiser 3.0L
  • - MerCruiser 165 HP
  • - MerCruiser 4.3L V6
  • - MerCruiser 5.0L V8
  • - MerCruiser 5.7L V8
  • - MerCruiser 7.4L V8
  • Exact plug selection varies significantly with model year, cylinder head and ignition system. Some later versions of these engines specify BR6FS, BPR6EFS or other plugs, so the engine serial number should be checked before odering.

Volvo Penta

  • - Volvo Penta AQ-series petrol engines
  • - Volvo Penta 4-cylinder GM-based engines
  • - Volvo Penta V6 GM-based engines
  • - Volvo Penta V8 GM-based engines

Cross-Reference Spark Plugs

  • - NGK: BP5FS
  • - NGK Stock Number: 4111
  • - Champion: RV12C
  • - Champion: RV15YC4

Important Fitment Information

  • The BP5FS is a non-resistor plug with a short-reach, tapered-seat design. Do not confuse it with
  • - BR6FS – resistor, different heat range/electrode configuration
  • - BPR6EFS – resistor, projected electrode and different reach
  • - BPR6ES – 19 mm reach with gasket seat
  • Confirm the engine's model, year, serial number and specified spark-plug gap before installation.

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough idle
  • - Engine misfire
  • - Hesitation during acceleration
  • - Reduced power
  • - Increased fuel consumption
  • - Carbon deposits
  • - Oil fouling
  • - Worn electrodes
  • - Corrosion
  • - Cracked ceramic insulation

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