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Marine & Outboard Spark Plugs

NGK Nickel Spark Plug DCPR6E (3481)

SKU: GB-DCPR6E

$8.80
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The NGK DCPR6E (Stock No. 3481) is a projected-tip resistor spark plug extensively used in Tohatsu, Mercury and Mariner four-stroke outboard motors. Featuring a nickel centre electrode, copper-core construction and interference-suppressing resistor, it provides reliable ignition and efficient heat transfer. With a 12 mm thread, 19 mm reach and 16 mm hex, DCPR6E suits numerous portable and mid-range four-stroke outboards.

Key benefits

Key Benefits

  • - Standard NGK nickel spark plug
  • - Widely used in Tohatsu and Mercury four-stroke outboards
  • - Projected centre electrode
  • - Copper-core construction for efficient heat transfer
  • - Built-in resistor reduces electrical interference
  • - Compact 16 mm / 5/8" hex
  • - M12 × 1.25 thread
  • - Long 19 mm / ¾" reach
  • - NGK heat range 6
  • - Iridium upgrade available as DCPR6EIX

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: DCPR6E
  • - NGK Stock Number: 3481
  • - 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: 16 mm / 5/8"
  • - Nominal 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

  • Tohatsu Outboards
  • - Tohatsu MFS4 – 4 HP
  • - Tohatsu MFS5 – 5 HP
  • - Tohatsu MFS6 – 6 HP
  • - Tohatsu MFS8 – 8 HP
  • - Tohatsu MFS9.8 – 9.8 HP
  • - Tohatsu MFS15 – 15 HP
  • - Tohatsu MFS18 – 18 HP
  • - Tohatsu MFS20 – 20 HP
  • - Tohatsu MFS25 – 25 HP
  • - Tohatsu MFS30 – 30 HP
  • NGK directly confirms, for example, MFS5, MFS6A, MFS9.8A, MFS15B2, MFS18B and MFS20C applications.
  • Earlier Tohatsu application data also identifies
  • - MFS25A – 25 HP 4-stroke – 2004–2006
  • - MFS30A – 30 HP 4-stroke – 2004–2006

Mercury Outboards

  • Mercury uses DCPR6E extensively on its Tohatsu-manufactured and related four-stroke engines.
  • - Mercury 2.5 HP 4-Stroke – serial 0R131842 & up
  • - Mercury 3.5 HP 4-Stroke – serial 0R131842 & up
  • - Mercury 4 HP 4-Stroke – selected Japanese and Belgian production
  • - Mercury 5 HP 4-Stroke – selected Japanese and Belgian production
  • - Mercury 6 HP 4-Stroke – selected Japanese and Belgian production
  • - Mercury 8 HP 4-Stroke – selected later production
  • - Mercury 9.9 HP 4-Stroke – selected later production
  • - Mercury 15 HP 351 cc 4-Stroke – serial 0R235949 & up
  • - Mercury 20 HP Carb 4-Stroke – serial 0R235168 & up
  • - Mercury 25 HP EFI 4-Stroke – selected production
  • - Mercury 25 HP Jet 4-Stroke – selected production
  • - Mercury 30 HP EFI 4-Stroke – selected production

Mariner Outboards

  • - Mariner 5 HP 4-Stroke – 1999–2002
  • - Mariner 6 HP 4-Stroke – 2000–2002
  • Later Mercury-built Mariner four-strokes can share Mercury's DCPR6E applications, but the exact model/year should be checked.

Cross-Reference / Part Numbers

  • - NGK: DCPR6E
  • - NGK Stock No.: 3481
  • - Mercury / Mariner: 33-803507
  • - Mercury: 803507
  • - Mercury current service reference: 8M0204682
  • - Mercury service-pack reference: 8M0234113
  • - NGK Iridium upgrade: DCPR6EIX
  • - NGK DCPR6EIX Stock No.: 8196

Important Fitment Information

  • The engine-specified electrode gap should take priority over the nominal plug gap. NGK lists DCPR6E at 0.9 mm, while specific marine applications can call for slightly different settings. For example, Mercury lists approximately 0.035" for its 2.5–6 HP applications and 0.033" for selected 8, 9.9, 15 and 20 HP engines.
  • Also distinguish
  • - DCPR6E – standard nickel plug
  • - DCPR6EIX – Iridium IX upgrade where approved
  • - DCPR7E – colder NGK heat range 7
  • - DPR6EA-9 – larger 18 mm hex and different application
  • - DPR6EB-9 – different application specification
  • The “C” in DCPR6E is important: DCPR6E uses the compact 16 mm hex, whereas DPR6EA-9 uses an 18 mm hex.

Signs the Spark Plug Needs Replacing

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

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