Back to catalogue
Marine & Outboard Spark Plugs

NGK Nickel Spark Plug DCPR7E (3932)

SKU: GB-DCPR7E

$8.80
Request a quote

The NGK DCPR7E (Stock No. 3932) is a projected-tip resistor spark plug used in selected Mercury, Mariner, Suzuki, Johnson and Evinrude four-stroke outboards. Featuring a nickel centre electrode, copper-core construction and interference-suppressing resistor, it provides reliable ignition and efficient heat transfer. Its compact 12 mm thread, 19 mm reach and 16 mm hex suit marine engines specifically requiring DCPR7E.

Key benefits

Key Benefits

  • - Standard NGK nickel spark plug
  • - Designed for selected four-stroke outboard motors
  • - Projected centre electrode
  • - Copper-core construction for efficient heat transfer
  • - Built-in resistor helps suppress electrical interference
  • - Compact 16 mm / 5/8" hex
  • - M12 × 1.25 thread
  • - 19 mm / ¾" reach
  • - NGK heat range 7
  • - Iridium alternative available as DCPR7EIX

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: DCPR7E
  • - NGK Stock Number: 3932
  • - 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: 0.8 mm / 0.031"
  • - NGK Heat Range: 7
  • - 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

  • Suzuki Outboards
  • DCPR7E has extensive application across selected Suzuki four-stroke outboards, particularly earlier-generation engines.
  • - Suzuki DF9.9 – 9.9 HP
  • - Suzuki DF15 – 15 HP
  • - Suzuki DF25 – 25 HP
  • - Suzuki DF30 – 30 HP
  • - Suzuki DF40 – 40 HP
  • - Suzuki DF50 – 50 HP
  • - Suzuki DF60 – 60 HP
  • - Suzuki DF70 – 70 HP
  • Typical model-specific applications include
  • - DF9.9 – 1997–2010, selected versions
  • - DF15 – 1997–2010, selected versions
  • - DF25 – 2000–2006
  • - DF30 – 2000–2007
  • - DF40 – selected early-generation models
  • - DF50 – selected early-generation models
  • - DF60 – selected early-generation models
  • - DF70 – selected early-generation models
  • Suzuki changed plug specifications during later engine revisions, so model year should be confirmed before ordering.

Because a number of Johnson four-stroke engines were based on Suzuki powerheads, DCPR7E is used in selected

  • - Johnson 9.9 HP 4-Stroke
  • - Johnson 15 HP 4-Stroke
  • - Johnson 25 HP 4-Stroke
  • - Johnson 30 HP 4-Stroke
  • - Johnson 40 HP 4-Stroke
  • - Johnson 50 HP 4-Stroke
  • - Johnson 60 HP 4-Stroke
  • - Johnson 70 HP 4-Stroke
  • These applications are primarily from the Suzuki-derived Johnson four-stroke era, rather than Johnson's traditional two-stroke engines.

Evinrude Outboards

  • Selected Suzuki-derived Evinrude four-stroke engines also use DCPR7E, including applications within
  • - Evinrude 9.9 HP 4-Stroke
  • - Evinrude 15 HP 4-Stroke
  • - Evinrude 25 HP 4-Stroke
  • - Evinrude 30 HP 4-Stroke
  • - Evinrude 40 HP 4-Stroke
  • - Evinrude 50 HP 4-Stroke
  • - Evinrude 60 HP 4-Stroke
  • - Evinrude 70 HP 4-Stroke
  • Exact year/model verification is important.

Mercury Outboards

  • DCPR7E is used in selected Mercury four-stroke applications, particularly engines from Mercury's shared-manufacturing era.
  • - Mercury 25 HP 4-Stroke
  • - Mercury 30 HP 4-Stroke
  • - Mercury 40 HP 4-Stroke
  • - Mercury 50 HP 4-Stroke
  • - Mercury 60 HP 4-Stroke
  • However, Mercury used multiple spark plugs across these horsepower ranges depending on whether the engine was Tohatsu-built, Yamaha-derived or Mercury-built. The complete serial number should therefore be checked.

Cross-Reference / OEM Part Numbers

  • - NGK: DCPR7E
  • - NGK Stock No.: 3932
  • - Suzuki: 09482-00460
  • - Suzuki: 09482-00459
  • - Johnson / Evinrude / BRP: selected Suzuki-derived service references
  • - NGK Iridium: DCPR7EIX
  • Cross-reference numbers should be used as interchange guidance rather than proof that a plug fits every engine carrying that manufacturer's name.

Important Fitment Information

  • DCPR7E should not be confused with the very similar DCPR6E
  • - DCPR6E – NGK heat range 6
  • - DCPR7E – NGK heat range 7 — colder plug
  • - DCPR7EIX – Iridium IX version where approved
  • - DPR7EA-9 – 18 mm hex and different application
  • - DPR6EA-9 – heat range 6 with 18 mm hex
  • - DPR6EB-9 – different application configuration
  • Both DCPR6E and DCPR7E use a 12 mm thread, 19 mm reach and compact 16 mm hex, making them physically similar. Do not substitute one heat range for the other solely because the dimensions match.
  • The engine manufacturer's specified electrode gap should always take priority over the nominal plug specification.

Signs the Spark Plug Needs Replacing

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

Shipping

Ships Australia-wide