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Marine & Outboard Spark Plugs

NGK V-Power Spark Plug ZFR6F-11 (4291)

SKU: GB-ZFR6F-11

$12.50
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The NGK ZFR6F-11 (Stock No. 4291) is a V-Groove resistor spark plug used in selected Tohatsu TLDI direct-injection outboards and early Mercury DFI applications. Its nickel centre electrode, copper core and projected firing-end design provide dependable ignition and efficient heat transfer. It features a 14 mm thread, 19 mm reach, 16 mm hex, NGK heat range 6 and 1.1 mm nominal gap.

Key benefits

Key Benefits

  • - NGK Stock Number: 4291
  • - V-Groove nickel centre electrode
  • - Copper-core construction
  • - Built-in resistor
  • - Projected firing end
  • - Trivalent-plated metal shell for corrosion resistance
  • - M14 × 1.25 thread
  • - 19 mm / 0.750" reach
  • - 16 mm / 5/8" hex
  • - 1.1 mm / 0.043" nominal gap
  • - NGK heat range 6
  • - Flat/gasket seat
  • - Iridium alternative available for verified applications: ZFR6FIX-11 – Stock No. 6441

Specifications & Dimensions

  • - Brand: NGK
  • - Part Number: ZFR6F-11
  • - NGK Stock Number: 4291
  • - Type: V-Groove resistor spark plug
  • - Thread Diameter: 14 mm / 0.551"
  • - Thread Size: M14 × 1.25
  • - Thread Reach: 19 mm / 0.750"
  • - Hex / Spanner Size: 16 mm / 5/8"
  • - Spark Gap: 1.1 mm / 0.043" nominal
  • - NGK Heat Range: 6
  • - Seat Type: Gasket
  • - Resistor: Yes
  • - Centre Electrode: Nickel
  • - Centre Electrode Core: Copper
  • - Firing End: Projected
  • - Terminal: Solid post
  • - Iridium Alternative: ZFR6FIX-11 – Stock No. 6441

Compatible Outboard Motors

  • Tohatsu TLDI
  • - Tohatsu MD40A TLDI – 2004–2007
  • - Tohatsu MD50A TLDI – 2004–2007
  • - Tohatsu MD70A / MD70A2 TLDI – selected production
  • - Tohatsu MD90A / MD90A2 TLDI – selected production

Mercury DFI

  • - Mercury 200 HP DFI V6 – 1996–1997

Cross-Reference / Related Part Numbers

  • - NGK: ZFR6F-11
  • - NGK Stock No.: 4291
  • - NGK Iridium: ZFR6FIX-11
  • - NGK Iridium Stock No.: 6441
  • - Champion: RC9MC4

Signs the Spark Plug Needs Replacing

  • - Difficult starting
  • - Rough or unstable idle
  • - Engine misfire
  • - Hesitation during acceleration
  • - Reduced power
  • - Poor high-RPM operation
  • - Increased fuel consumption
  • - Carbon or fuel fouling
  • - Excessive electrode wear
  • - Enlarged electrode gap
  • - Corrosion
  • - Cracked ceramic insulator

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