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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug DPR6EB-9 (3108)

SKU: GB-DPR6EB-9

$8.80
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The NGK DPR6EB-9 (Stock No. 4536) is a projected-tip resistor spark plug used in selected Honda four-stroke outboard motors. Featuring a nickel centre electrode, copper-core construction and built-in resistor, it delivers dependable ignition, efficient heat transfer and reduced electrical interference. Its 12 mm thread, 19 mm reach and 0.9 mm factory gap suit marine engines specifically designed for the DPR6EB-9 configuration.

Key benefits

Key Benefits

  • - Standard NGK nickel spark plug
  • - Designed for selected Honda four-stroke outboards
  • - Projected-tip electrode design
  • - Copper-core centre electrode for efficient heat transfer
  • - Built-in resistor helps suppress electrical interference
  • - 0.9 mm / 0.035" factory gap
  • - NGK heat range 6
  • - 19 mm / ¾" thread reach
  • - Flat gasket seat
  • - Proven marine-engine spark plug design

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: DPR6EB-9
  • - NGK Stock Number: 4536
  • - Spark Plug Type: Standard resistor
  • - Thread Diameter: 12 mm / 0.472"
  • - Thread Size: M12 × 1.25
  • - Thread Pitch: 1.25 mm / 0.049"
  • - Thread Reach: 19 mm / 0.750"
  • - Hex / Spanner Size: 18 mm / 0.709"
  • - Factory Spark Gap: 0.9 mm / 0.035"
  • - NGK Heat Range: 6
  • - Seat Type: Flat / gasket
  • - Resistor: Yes
  • - Centre Electrode: Nickel
  • - Centre Electrode Core: Copper
  • - Centre Electrode Type: Projected
  • - Ground Electrode: Nickel
  • - Ground Electrodes: 1
  • - Sealing Washer: Yes

Compatible Outboard Motors

  • Honda Outboards
  • - Honda BF8 – 8 HP
  • - Honda BF9.9 – 9.9 HP
  • - Honda BF10 – 10 HP
  • - Honda BF15 – 15 HP
  • - Honda BF20 – 20 HP
  • - Honda BF25 – 25 HP
  • - Honda BF30 – 30 HP
  • - Honda BF40 – 40 HP
  • - Honda BF50 – 50 HP
  • Exact plug selection depends on the engine model suffix, production year and serial number.

Honda BF8 / BF9.9 / BF10

  • - BF8D
  • - BF9.9D
  • - BF10D
  • These should be distinguished from earlier BF8/BF9.9/BF10 engines that can specify DPR6EA-9 or another plug.

Honda BF15 / BF20

  • - BF15D
  • - BF20D
  • These twin-cylinder four-stroke engines are commonly associated with DPR6EB-9 in marine application catalogues.

Honda BF25 / BF30

  • - BF25
  • - BF30
  • also appear against DPR6EB-9, depending on engine generation.

Honda BF40 / BF50

  • - BF40
  • - BF50
  • four-stroke applications use DPR6EB-9, but later EFI generations may specify different plugs. Confirm the complete engine model before ordering.

Cross-Reference Spark Plugs & Part Numbers

  • - NGK: DPR6EB-9
  • - NGK Stock Number: 4536
  • - Honda: 98069-5697P
  • - NGK Iridium equivalent family: DPR6EIX-9 – only where approved for the engine
  • Cross-reference numbers should be treated as interchange information rather than proof of engine compatibility.

Important Fitment Information

  • Although DPR6EB-9 and DPR6EA-9 have very similar basic dimensions, they should not automatically be treated as the same spark plug.
  • Both have
  • - M12 × 1.25 thread
  • - 19 mm reach
  • - 18 mm hex
  • - NGK heat range 6
  • - 0.9 mm nominal gap
  • However, the A/B suffix identifies differences in the plug design/application specification, so the exact plug specified by Honda should be used.
  • Also distinguish
  • - DPR5EA-9 – hotter heat range 5
  • - DPR6EA-9 – different application configuration
  • - DPR6EB-9 – this plug
  • - DPR7EA-9 – colder heat range 7
  • - DPR6EIX-9 – Iridium IX
  • - DR6HS – only 12.7 mm thread reach

Signs the Spark Plug Needs Replacing

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

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