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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug BP6FS (3512)

SKU: GB-BP6FS

$8.80
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The NGK BP6FS (Stock No. 3512) is a non-resistor, projected-tip nickel spark plug used in selected marine inboard and automotive engines. It features an M14 thread, short 11.2 mm reach, 16 mm hex, tapered seat and 0.8 mm nominal gap. Its copper-core centre electrode provides efficient heat transfer and dependable ignition, making BP6FS suitable for engines specifically designed around this short-reach tapered-seat plug configuration.

Key benefits

Key Benefits

  • - Standard nickel spark plug
  • - Projected firing end
  • - Copper-core centre electrode
  • - Non-resistor construction
  • - NGK heat range 6
  • - 0.8 mm / 0.032" nominal gap
  • - Short 11.2 mm / 0.441" reach
  • - Compact 16 mm / 5/8" hex
  • - Tapered seat — no sealing washer
  • - Suitable for selected marine inboard engines
  • - Direct replacement where BP6FS is specified

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: BP6FS
  • - NGK Stock Number: 3512
  • - Spark Plug Type: Standard nickel
  • - Thread Diameter: 14.0 mm / 0.551"
  • - Thread Size: M14
  • - Thread Reach: 11.2 mm / 0.441"
  • - Hex / Spanner Size: 16 mm / 5/8"
  • - Spark Gap: 0.8 mm / 0.032"
  • - NGK Heat Range: 6
  • - Seat Type: Tapered / conical
  • - Sealing Washer: No
  • - Resistor: No
  • - Electrode Configuration: Projected
  • - Centre Electrode: Nickel with copper core
  • - Ground Electrodes: 1
  • - Terminal: Solid post

Compatible Marine Engines

  • BP6FS is primarily a marine inboard/sterndrive and automotive-style engine spark plug, rather than a conventional small outboard plug.
  • Volvo Penta
  • - Volvo Penta AQ210A — engine numbers 177315 onward
  • - Volvo Penta AQ225
  • Both applications specify BP6FS, Stock No. 3512, with 0.8 mm gap. The catalogue lists BPR6FS as the resistor alternative for these applications.

Cross-Reference Spark Plugs / Part Numbers

  • - NGK: BP6FS
  • - NGK Stock No.: 3512
  • - NGK resistor equivalent: BPR6FS – Stock No. 2623 for applications specifically allowing the resistor version
  • - Champion: BL9Y
  • - Champion: V9YC

Important Fitment Information

  • BP6FS is different from BP6HS, BP6ES and BPR6FS.
  • - BP6FS — non-resistor, projected, 11.2 mm reach, tapered seat
  • - BPR6FS — resistor version of the same basic short tapered-seat configuration
  • - BP6HS — 12.7 mm reach and different seat/configuration
  • - BP6ES — 19 mm reach
  • The F-series short tapered seat is critical. Do not substitute an HS- or ES-series plug simply because the thread diameter and heat range are the same.

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
  • - Damaged ceramic insulator
  • - Corrosion around the plug shell

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