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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug DR6HS (4823) (6512)

SKU: GB-DR6HS

$8.80
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The NGK DR6HS (Stock No. 4823) is a standard resistor spark plug used in selected marine and small-engine applications. It features a 12 mm thread, 12.7 mm reach, 18 mm hex and NGK heat range 6, with a copper-core nickel centre electrode for dependable ignition and heat transfer. DR6HS is suitable for engines specifically specifying this short-reach resistor plug.

Key benefits

Key Benefits

  • - Standard NGK resistor spark plug
  • - Copper-core centre electrode
  • - Nickel centre and ground electrodes
  • - Built-in resistor helps reduce electrical interference
  • - Short 12.7 mm / ½" reach
  • - Compact M12 × 1.25 thread
  • - Flat gasket seat
  • - NGK heat range 6
  • - Suitable for selected marine and small-engine applications

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: DR6HS
  • - NGK Stock Number: 4823
  • - 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: 12.7 mm / 0.500"
  • - Hex / Spanner Size: 18 mm / 0.709"
  • - NGK Heat Range: 6
  • - Factory Electrode Gap: approximately 0.7 mm / 0.028"
  • - Seat Type: Flat / gasket seat
  • - Resistor: Yes
  • - Centre Electrode: Nickel
  • - Centre Electrode Core: Copper
  • - Electrode Projection: Non-projected
  • - Ground Electrode: Nickel
  • - Ground Electrodes: 1
  • - Sealing Washer: Yes

Compatible Outboard Motors

  • Honda Outboards
  • - Honda BF7.5 – 7.5 HP
  • - Honda BF8 – 8 HP
  • - Honda BF9.9 – 9.9 HP
  • - Honda BF10 – 10 HP
  • - Honda BF15 – 15 HP
  • Honda changed spark-plug specifications across model generations. Many later BF8/BF9.9/BF10/BF15 engines use other NGK plugs, including DR5HS, DR5HS-10, DR6HS, DR6HS-10 or long-reach plug families depending on model/year.

Cross-Reference Spark Plugs & Part Numbers

  • - NGK: DR6HS
  • - NGK Stock Number: 4823
  • - Denso: X20FSR-U
  • - Champion: RA6HC

Important Fitment Information

  • DR6HS uses a relatively uncommon M12 × 1.25 thread with a 12.7 mm reach.
  • Do not confuse
  • - DR6HS – standard short-reach resistor plug
  • - DR6HS-10 – related plug with a 1.0 mm factory gap
  • - DR5HS – hotter NGK heat range 5
  • - DR5HS-10 – heat range 5 with 1.0 mm factory gap
  • - DPR6EA-9 – projected, longer-reach plug with different dimensions
  • - DPR6EB-9 – different electrode/application configuration
  • Even when the thread diameter is the same, the reach, heat range, projection and specified gap must match the engine.

Signs the Spark Plug Needs Replacing

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

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