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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug CPR6EA-9 (6899)

SKU: GB-CPR6EA-9

$10.20
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The NGK CPR6EA-9 (Stock No. 6899) is a compact projected-tip resistor spark plug used in selected Honda four-stroke outboard motors, particularly newer small portable models. Featuring a nickel centre electrode, copper-core construction and built-in resistor, it provides reliable ignition and effective heat transfer. Its M10 × 1.0 thread, 19 mm reach, 16 mm hex and 0.9 mm factory gap suit engines specifically specifying CPR6EA-9.

Key benefits

Key Benefits

  • - NGK Stock Number: 6899
  • - Suitable for selected Honda four-stroke outboards
  • - Projected-tip electrode
  • - Built-in resistor for electrical-noise suppression
  • - Nickel centre electrode
  • - Copper-core construction
  • - M10 × 1.0 thread
  • - 19 mm / ¾" reach
  • - Compact 16 mm / 5/8" hex
  • - 0.9 mm / 0.035" factory gap
  • - NGK heat range 6
  • - Flat gasket seat

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: CPR6EA-9
  • - NGK Stock Number: 6899
  • - Spark Plug Type: Standard resistor
  • - Thread Diameter: 10 mm / 0.394"
  • - Thread Size: M10 × 1.0
  • - Thread Pitch: 1.0 mm / 0.039"
  • - Thread Reach: 19 mm / 0.748"
  • - Hex / Spanner Size: 16 mm / 5/8"
  • - 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
  • - Electrode Type: Projected
  • - Ground Electrode: Nickel
  • - Ground Electrodes: 1
  • - Sealing Washer: Yes

Compatible Outboard Motors

  • Honda Outboards
  • CPR6EA-9 is used in selected Honda portable four-stroke outboards, with fitment depending on the exact model generation.
  • - Honda BF4 – 4 HP
  • - Honda BF5 – 5 HP
  • - Honda BF6 – 6 HP
  • In particular, this plug is associated with the newer-generation BF4/BF5/BF6 single-cylinder four-stroke family, rather than all earlier Honda engines carrying the same horsepower designation.

Honda BF4

  • Selected newer
  • - Honda BF4D
  • - Honda BF4DH
  • four-stroke portable outboards use CPR6EA-9.

Honda BF5

  • Selected newer
  • - Honda BF5D
  • - Honda BF5DH
  • four-stroke portable outboards use CPR6EA-9.

Honda BF6

  • - Honda BF6A
  • - Honda BF6AH
  • portable four-stroke engines use CPR6EA-9.
  • Again, exact model suffix and production date should be checked when determining fitment.

Cross-Reference Spark Plugs & Part Numbers

  • - NGK: CPR6EA-9
  • - NGK Stock Number: 6899
  • - Honda: 31916-ZVD-003
  • - Honda: 98056-56916
  • Cross-reference numbers should be treated as interchange information rather than proof of fitment for every engine.

Signs the Spark Plug Needs Replacing

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

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