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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug DR7EA (7839)

SKU: GB-DR7EA

$8.80
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The NGK DR7EA (Stock No. 7839) is a standard resistor spark plug featuring a nickel centre electrode and copper-core construction for dependable ignition and efficient heat transfer. It uses an M12 × 1.25 thread, 19 mm reach and 18 mm hex, with NGK heat range 7. DR7EA is primarily used in motorcycle and small-engine applications, with limited verified conventional outboard-motor fitment.

Key benefits

Key Benefits

  • - Standard NGK resistor spark plug
  • - Copper-core construction for effective heat transfer
  • - Nickel centre electrode
  • - Built-in resistor helps suppress electrical interference
  • - M12 × 1.25 thread
  • - 19 mm / ¾" reach
  • - 18 mm hex
  • - NGK heat range 7
  • - Flat gasket seat
  • - Durable standard electrode construction

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: DR7EA
  • - NGK Stock Number: 7839
  • - 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 / 0.748"
  • - Hex / Spanner Size: 18 mm / 0.709"
  • - Factory Spark Gap: approximately 0.7 mm / 0.028"
  • - NGK Heat Range: 7
  • - Seat Type: Flat / gasket
  • - Resistor: Yes
  • - Centre Electrode: Nickel
  • - Centre Electrode Core: Copper
  • - Electrode Projection: Non-projected
  • - Ground Electrode: Nickel
  • - Ground Electrodes: 1
  • - Sealing Washer: Yes

Cross-Reference Spark Plugs

  • - NGK: DR7EA
  • - NGK Stock Number: 7839
  • - NGK Iridium: DR7EIX – where approved
  • - Champion: RA6HC
  • Cross-reference numbers should be treated as dimensional/performance interchange information and not as evidence of outboard-engine compatibility.

Signs the Spark Plug Needs Replacing

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

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