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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug AP7FS (2127)

SKU: GB-AP7FS

$8.80
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The NGK AP7FS (Stock No. 2127) is a standard nickel spark plug featuring an 18 mm thread, tapered seat and projected electrode design. Its copper-core construction provides efficient heat transfer and consistent ignition performance. Designed for engines specifically calling for AP7FS or an approved equivalent, this plug is found primarily in older marine and automotive applications. Always confirm the original engine specification before installation.

Key benefits

Key Benefits

  • - Standard NGK nickel spark plug
  • - Copper-core centre electrode for efficient heat dissipation
  • - Projected electrode design
  • - Non-resistor configuration
  • - Tapered-seat construction
  • - Large 18 mm thread
  • - Reliable ignition and combustion
  • - Suitable for selected older marine engine applications
  • - Cross-references to several Champion F7-series plugs

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: AP7FS
  • - NGK Stock Number: 2127
  • - Plug Type: Standard
  • - Electrode Type: Projected
  • - Centre Electrode: Nickel with copper core
  • - Thread Diameter: 18.0 mm / 0.709"
  • - Thread Size: M18
  • - Thread Length / Reach: 10.9 mm / 0.429"
  • - Hex / Wrench Size: 20.8 mm / approximately 13/16"
  • - Spark Gap: 0.9 mm / 0.035"
  • - NGK Heat Range: 7
  • - Seat Type: Tapered / conical
  • - Resistor: Non-resistor
  • - Ground Electrodes: 1

The directly verified marine application is

  • - Interceptor 260 – petrol marine inboard engine – AP7FS – 0.9 mm gap

Cross-Reference Spark Plugs

  • - Champion F7Y → NGK AP7FS
  • - Champion F7YC → NGK AP7FS
  • - Champion F7YCC → NGK AP7FS

Important Fitment Information

  • The AP7FS uses the comparatively large 18 mm thread with a short 10.9 mm reach and tapered seat. Do not substitute a spark plug merely because its thread diameter is the same. Thread reach, seat design, electrode projection, heat range and required gap must also be suitable for the engine.

Signs the Spark Plug Needs Replacing

  • Replace or inspect the spark plug if the engine develops difficult starting, rough idle, intermittent misfiring, poor acceleration, reduced power, increased fuel consumption, excessive carbon or oil fouling, electrode erosion, corrosion or cracked ceramic insulation.

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